Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reclassifications out of AOCI [Line Items]
Other income (expense) - net	$ (1.5)	$ (11.2)	$ (2.1)	$ (1.9)
Interest expense	56.1	41.9	111.4	89.1
Tax benefit (expense)	(17.5)	(0.1)	(29.3)	(9.4)
Net income (loss)	18.8	0.0	51.6	29.8
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications out of AOCI [Line Items]
Interest expense	(18.7)	(0.2)	(33.0)	0.9
Total before tax	(19.3)	(0.3)	(34.3)	0.7
Tax benefit (expense)	5.0	0.1	8.7	(0.2)
Net income (loss)	(14.3)	(0.2)	(25.6)	0.5
Amortization of prior service costs | Reclassification out of Accumulated Other Comprehensive Income
Reclassifications out of AOCI [Line Items]
Other income (expense) - net	(0.1)	(0.1)	(0.2)	(0.2)
Amortization of actuarial gain/loss | Reclassification out of Accumulated Other Comprehensive Income
Reclassifications out of AOCI [Line Items]
Other income (expense) - net	$ (0.5)	$ 0.0	$ (1.1)	$ 0.0