Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 35.2	$ 9.0
Other Comprehensive income:
Foreign currency translation adjustment, net of tax	(12.5)	7.8
Reclassification adjustment from loss on partial settlement of pension plan, net of tax	0.0	3.8
Change in pension liability adjustment, net of tax	(0.3)	0.6
Change in fair value of derivative financial instruments, net of tax	11.5	0.3
Total other comprehensive (loss) income:	(1.3)	12.5
Comprehensive income	$ 33.9	$ 21.5