Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	$ (2,273.0)	$ (2,029.6)	$ (2,019.2)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	9.9	11.2	12.6	$ 14.6
OCI, before Reclassifications, before Tax, Attributable to Parent	(3.6)	5.8	12.5
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	(5.3)	4.0	10.1
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(0.4)	(0.4)	(0.4)
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	106.3	152.1	95.4	43.7
OCI, before Reclassifications, before Tax, Attributable to Parent	45.8	(56.7)	(51.7)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.0	0.0	0.0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	(51.4)	(48.3)	(52.6)	(79.2)
OCI, before Reclassifications, before Tax, Attributable to Parent	(4.1)	(1.6)	22.7
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	(0.1)	(8.1)	(12.8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(0.9)	2.2	8.9
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	167.6	211.6	160.6	$ 137.5
OCI, before Reclassifications, before Tax, Attributable to Parent	38.1	(52.5)	(16.5)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	5.4	4.1	2.7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 0.5	$ (2.6)	$ (9.3)