Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	$ (2,019.2)	$ (1,957.4)	$ (1,835.1)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	12.6	14.6	10.1	$ 14.0
OCI, before Reclassifications, before Tax, Attributable to Parent	12.5	(20.4)	17.4
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	10.1	(14.9)	11.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(0.4)	1.0	(1.7)
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	95.4	43.7	68.1	58.0
OCI, before Reclassifications, before Tax, Attributable to Parent	(51.7)	24.4	(10.1)
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	(52.6)	(79.2)	(85.4)	(92.6)
OCI, before Reclassifications, before Tax, Attributable to Parent	22.7	(3.8)	1.5
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	(12.8)	(12.1)	(7.6)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8.9	2.1	1.9
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity Attributable to Parent	160.6	137.5	163.6	$ 164.6
OCI, before Reclassifications, before Tax, Attributable to Parent	(16.5)	0.2	8.8
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent	2.7	27.0	(4.2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (9.3)	$ (1.1)	$ (3.6)