Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,576.8	$ 2,680.6	$ 2,881.0	$ 2,746.7	$ 2,776.2	$ 2,684.9	$ 2,881.0	$ 2,684.9
Other comprehensive income (loss) before reclassifications							5.8	(45.9)
Amounts reclassified out from accumulated other comprehensive income (loss)							1.7	5.9
Other comprehensive income (loss), net of tax	80.6	(24.6)	(48.5)	(39.5)	(15.1)	14.6	7.5	(40.0)
Ending balance	2,752.1	2,576.8	2,680.6	2,868.2	2,746.7	2,776.2	2,752.1	2,868.2
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(216.9)	(192.3)	(143.8)	(183.5)	(168.4)	(183.0)	(143.8)	(183.0)
Other comprehensive income (loss), net of tax	80.6	(24.6)	(48.5)	(39.5)	(15.1)	14.6
Ending balance	(136.3)	$ (216.9)	(192.3)	(223.0)	$ (183.5)	(168.4)	(136.3)	(223.0)
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			0.0			0.2	0.0	0.2
Other comprehensive income (loss) before reclassifications							(0.3)	(8.8)
Amounts reclassified out from accumulated other comprehensive income (loss)							2.3	7.0
Other comprehensive income (loss), net of tax							2.0	(1.8)
Ending balance	2.0			(1.6)			2.0	(1.6)
Change in equity affiliate investment AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			2.3			1.6	2.3	1.6
Other comprehensive income (loss) before reclassifications							0.0	(0.1)
Amounts reclassified out from accumulated other comprehensive income (loss)							0.0	0.0
Other comprehensive income (loss), net of tax							0.0	(0.1)
Ending balance	2.3			1.5			2.3	1.5
Defined benefit pension and other postretirement plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(10.1)			(9.4)	(10.1)	(9.4)
Other comprehensive income (loss) before reclassifications							(0.6)	(0.1)
Amounts reclassified out from accumulated other comprehensive income (loss)							(0.6)	(1.1)
Other comprehensive income (loss), net of tax							(1.2)	(1.2)
Ending balance	(11.3)			(10.6)			(11.3)	(10.6)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ (136.0)			$ (175.4)	(136.0)	(175.4)
Other comprehensive income (loss) before reclassifications							6.7	(36.9)
Amounts reclassified out from accumulated other comprehensive income (loss)							0.0	0.0
Other comprehensive income (loss), net of tax							6.7	(36.9)
Ending balance	$ (129.3)			$ (212.3)			$ (129.3)	$ (212.3)