Other Comprehensive (Loss) Earnings - Amounts Recognized in OCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign currency translation:
Foreign currency translation, before tax	$ (9.9)	$ 27.1	$ 0.8
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent	0.0	0.0	0.0
Foreign currency translation, net of tax	(9.9)	27.1	0.8
Employee benefit plans:
Employee benefit plans, before Tax	(0.4)	1.3	(5.0)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent	0.2	0.0	(0.1)
Net change in employee benefit plans	(0.2)	1.3	(5.1)
Changes in fair value of cash flow hedges:
Change in fair value of cash flow hedges, before tax	(1.0)	4.4	(2.2)
Change in fair value of cash flow hedges, tax	0.1	(0.7)	0.6
Total cash flow hedges	(0.9)	3.7	(1.6)
Total:
Other Comprehensive Income (Loss), before tax	(11.3)	32.8	(6.4)
Other Comprehensive Income (Loss), tax	0.3	(0.7)	0.5
Other comprehensive earnings (loss), net of tax	$ (11.0)	$ 32.1	$ (5.9)