CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 510.9	$ 386.0	$ 342.2
Other comprehensive income (loss):
Reclassification adjustment transferred to Net income from cash flow hedges	0.1	0.1	0.5
Pension and other postretirement benefit costs, net of tax	3.9	2.8	(7.4)
Total Comprehensive Income	$ 514.9	$ 388.9	$ 335.3

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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