Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassifications out of AOCI [Line Items]
Other income (expense)- net	$ 0.3	$ (5.3)	$ 13.9
Interest expense	263.7	221.9	193.2
Tax benefit (expense)	33.7	34.2	28.8
Net income (loss)	(24.5)	(43.7)	4.1
Amount reclassified from accumulated other comprehensive income (loss)
Reclassifications out of AOCI [Line Items]
Interest expense	(45.8)	(75.4)	(13.2)
Total before tax	(48.0)	(78.2)	(13.0)
Tax benefit (expense)	14.7	20.7	3.4
Net income (loss)	(33.3)	(57.5)	(9.6)
Amortization of prior service costs | Amount reclassified from accumulated other comprehensive income (loss)
Reclassifications out of AOCI [Line Items]
Other income (expense)- net	(0.5)	(0.4)	0.1
Amortization of actuarial gain/loss | Amount reclassified from accumulated other comprehensive income (loss)
Reclassifications out of AOCI [Line Items]
Other income (expense)- net	$ (1.7)	$ (2.4)	$ 0.1