Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 16,496.3	$ 18,546.6	$ 16,409.6	$ 17,580.4
Other comprehensive income (loss) before reclassifications			(224.3)	43.9
Amounts reclassified from accumulated other comprehensive income (loss)			(4.6)	(7.1)
Total other comprehensive (loss) income	(169.2)	5.2	(228.9)	36.8
Ending balance	17,175.4	14,774.7	17,175.4	14,774.7
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	68.1	17.3	127.8	(14.3)
Total other comprehensive (loss) income	(169.2)	5.2	(228.9)	36.8
Ending balance	(101.1)	22.5	(101.1)	22.5
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			9.7	1.1
Other comprehensive income (loss) before reclassifications			29.4	5.6
Amounts reclassified from accumulated other comprehensive income (loss)			0.0	0.0
Total other comprehensive (loss) income			29.4	5.6
Ending balance	39.1	6.7	39.1	6.7
On Available-For-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			7.1	9.6
Other comprehensive income (loss) before reclassifications			26.3	(29.2)
Amounts reclassified from accumulated other comprehensive income (loss)			(2.4)	4.1
Total other comprehensive (loss) income			23.9	(25.1)
Ending balance	31.0	(15.5)	31.0	(15.5)
On Foreign Currency Forward Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			111.0	(25.0)
Other comprehensive income (loss) before reclassifications			(280.0)	67.5
Amounts reclassified from accumulated other comprehensive income (loss)			(2.2)	(11.2)
Total other comprehensive (loss) income			(282.2)	56.3
Ending balance	$ (171.2)	$ 31.3	$ (171.2)	$ 31.3

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Name Accounting Standards Codification
-Section S50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

VERTEX PHARMACEUTICALS INC / MA 10-Q