Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 35.6	$ 30.6	$ 71.7	$ 57.7
Other comprehensive income (loss), net of tax:
Unrealized (loss) income on derivative instruments, net of tax benefit (expense) of $0.3 and $0.2 and $(1.1) and $1.5, respectively	(0.7)	0.0	2.8	(3.5)
Foreign currency translation adjustments, net of tax (expense) benefit of $1.2 and $0.4 and $(1.6) and $4.6, respectively	(4.5)	1.2	(18.6)	(5.6)
Recognition of deferred pension and other post-retirement items, net of tax (expense) benefit of $(0.4) and $0.6 and $(1.9) and $1.4, respectively	1.1	(2.0)	6.2	(5.2)
Other comprehensive loss, net of tax	(4.1)	(0.8)	(9.6)	(14.3)
Comprehensive income	$ 31.5	$ 29.8	$ 62.1	$ 43.4