Other Comprehensive (Loss) Income - Changes in AOCI, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	$ 541.1	$ 481.4
Current period other comprehensive income (loss)	(33.5)	3.2
Ending balance	509.4	508.0
Defined Benefit Pension and Other Postretirement Plans
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(2.7)	(2.2)
Current period other comprehensive income (loss)	0.1	0.0
Ending balance	(2.6)	(2.2)
Currency Translation Adjustments
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(114.2)	(117.8)
Current period other comprehensive income (loss)	(33.8)	3.3
Ending balance	(148.0)	(114.5)
Hedging Activities
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(0.1)	0.0
Current period other comprehensive income (loss)	0.2	(0.1)
Ending balance	0.1	(0.1)
Total
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(117.0)	(120.0)
Current period other comprehensive income (loss)	(33.5)	3.2
Ending balance	$ (150.5)	$ (116.8)