Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 30.6	$ 22.7	$ 57.7	$ 89.4
Other comprehensive income (loss), net of tax:
Unrealized income (loss) on derivative instruments, net of tax benefit (expense) of $0.2 and $(0.2) and $1.5 and $0.7, respectively	0.0	0.5	(3.5)	(1.6)
Foreign currency translation adjustments, net of tax benefit (expense) of $0.4 and $0.0 and $4.6 and $0.0, respectively	1.2	(4.9)	(5.6)	35.4
Recognition of deferred pension and other post-retirement items, net of tax benefit (expense) of $0.6 and $(0.9) and $1.4 and $(3.6), respectively	(2.0)	2.7	(5.2)	10.0
Other comprehensive (loss) income, net of tax	(0.8)	(1.7)	(14.3)	43.8
Comprehensive income	$ 29.8	$ 21.0	$ 43.4	$ 133.2