Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassifications out of AOCI [Line Items]
Other income (expense) - net	$ 0.9	$ 3.3	$ (0.6)	$ 1.2
Interest expense	61.3	57.0	205.6	168.4
Tax benefit (expense)	(1.8)	(11.2)	(48.9)	(40.5)
Net income (loss)	(4.2)	(5.3)	33.4	46.3
Amount reclassified from accumulated other comprehensive income (loss)
Reclassifications out of AOCI [Line Items]
Interest expense	(8.6)	(20.6)	(39.7)	(53.6)
Total before tax	(9.0)	(21.3)	(41.0)	(55.7)
Tax benefit (expense)	2.1	(2.3)	10.3	6.4
Net income (loss)	(6.9)	(23.6)	(30.7)	(49.3)
Amortization of prior service costs | Amount reclassified from accumulated other comprehensive income (loss)
Reclassifications out of AOCI [Line Items]
Other income (expense) - net	(0.1)	(0.1)	(0.4)	(0.3)
Amortization of actuarial gain/loss | Amount reclassified from accumulated other comprehensive income (loss)
Reclassifications out of AOCI [Line Items]
Other income (expense) - net	$ (0.3)	$ (0.6)	$ (0.9)	$ (1.8)