Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 2,483.9	$ 2,288.0	$ 4,768.5	$ 4,472.8
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,804.1	1,713.4	3,492.5	3,334.4
EMEA
Disaggregation of Revenue [Line Items]
Revenue	259.8	221.9	464.7	444.2
APAC
Disaggregation of Revenue [Line Items]
Revenue	420.0	352.7	811.3	694.2
Services \| Over time
Disaggregation of Revenue [Line Items]
Revenue	1,668.0	1,561.4	3,271.7	3,112.1
Services \| Americas \| Over time
Disaggregation of Revenue [Line Items]
Revenue	1,202.1	1,183.4	2,388.9	2,351.2
Services \| EMEA \| Over time
Disaggregation of Revenue [Line Items]
Revenue	129.5	107.6	234.4	216.7
Services \| APAC \| Over time
Disaggregation of Revenue [Line Items]
Revenue	336.4	270.4	648.4	544.2
Leasing \| At a point in time
Disaggregation of Revenue [Line Items]
Revenue	493.1	456.5	911.5	844.2
Leasing \| Americas \| At a point in time
Disaggregation of Revenue [Line Items]
Revenue	388.0	358.3	734.3	663.8
Leasing \| EMEA \| At a point in time
Disaggregation of Revenue [Line Items]
Revenue	61.7	54.0	101.1	107.7
Leasing \| APAC \| At a point in time
Disaggregation of Revenue [Line Items]
Revenue	43.4	44.2	76.1	72.7
Capital markets \| At a point in time
Disaggregation of Revenue [Line Items]
Revenue	207.8	163.6	365.6	305.8
Capital markets \| Americas \| At a point in time
Disaggregation of Revenue [Line Items]
Revenue	171.7	132.7	287.6	244.3
Capital markets \| EMEA \| At a point in time
Disaggregation of Revenue [Line Items]
Revenue	23.7	19.2	41.7	34.8
Capital markets \| APAC \| At a point in time
Disaggregation of Revenue [Line Items]
Revenue	12.4	11.7	36.3	26.7
Valuation and other \| At a point in time or over time
Disaggregation of Revenue [Line Items]
Revenue	115.0	106.5	219.7	210.7
Valuation and other \| Americas \| At a point in time or over time
Disaggregation of Revenue [Line Items]
Revenue	42.3	39.0	81.7	75.1
Valuation and other \| EMEA \| At a point in time or over time
Disaggregation of Revenue [Line Items]
Revenue	44.9	41.1	87.5	85.0
Valuation and other \| APAC \| At a point in time or over time
Disaggregation of Revenue [Line Items]
Revenue	$ 27.8	$ 26.4	$ 50.5	$ 50.6

Cushman & Wakefield plc 10-Q