Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,929.1	$ 2,683.1	$ 2,682.3	$ 2,576.8	$ 2,680.6	$ 2,881.0	$ 2,682.3	$ 2,881.0
Other comprehensive income (loss) before reclassifications							156.0	5.8
Amounts reclassified out from accumulated other comprehensive income (loss)							(0.2)	1.7
Other comprehensive (loss) income, net of tax	(13.6)	116.8	52.6	80.6	(24.6)	(48.5)	155.8	7.5
Ending balance	3,051.5	2,929.1	2,683.1	2,752.1	2,576.8	2,680.6	3,051.5	2,752.1
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(88.7)	(205.5)	(258.1)	(216.9)	(192.3)	(143.8)	(258.1)	(143.8)
Other comprehensive (loss) income, net of tax	(13.6)	116.8	52.6	80.6	(24.6)	(48.5)
Ending balance	(102.3)	$ (88.7)	(205.5)	(136.3)	$ (216.9)	(192.3)	(102.3)	(136.3)
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(2.5)			0.0	(2.5)	0.0
Other comprehensive income (loss) before reclassifications							3.2	(0.3)
Amounts reclassified out from accumulated other comprehensive income (loss)							0.2	2.3
Other comprehensive (loss) income, net of tax							3.4	2.0
Ending balance	0.9			2.0			0.9	2.0
Change in equity affiliate investment AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			2.5			2.3	2.5	2.3
Other comprehensive income (loss) before reclassifications							0.1	0.0
Amounts reclassified out from accumulated other comprehensive income (loss)							0.0	0.0
Other comprehensive (loss) income, net of tax							0.1	0.0
Ending balance	2.6			2.3			2.6	2.3
Defined benefit pension and other postretirement plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(9.8)			(10.1)	(9.8)	(10.1)
Other comprehensive income (loss) before reclassifications							(0.6)	(0.6)
Amounts reclassified out from accumulated other comprehensive income (loss)							(0.4)	(0.6)
Other comprehensive (loss) income, net of tax							(1.0)	(1.2)
Ending balance	(10.8)			(11.3)			(10.8)	(11.3)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ (248.3)			$ (136.0)	(248.3)	(136.0)
Other comprehensive income (loss) before reclassifications							153.3	6.7
Amounts reclassified out from accumulated other comprehensive income (loss)							0.0	0.0
Other comprehensive (loss) income, net of tax							153.3	6.7
Ending balance	$ (95.0)			$ (129.3)			$ (95.0)	$ (129.3)