Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 25.7	$ 23.5	$ 36.1	$ 27.1
Other comprehensive income (loss), net of tax:
Unrealized income (loss) on derivative instruments, net of tax (expense) benefit of $(1.1) and $0.6 and $(1.4) and $1.3, respectively	2.9	(1.6)	3.5	(3.5)
Foreign currency translation adjustments, net of tax (expense) benefit of $(0.1) and $4.2 and $(2.8) and $4.2, respectively	(9.8)	(19.3)	(14.1)	(6.8)
Recognition of deferred pension and other post-retirement items, net of tax (expense) benefit of $(2.4) and $0.7 and $(1.5) and $0.8, respectively	7.7	(2.7)	5.1	(3.2)
Other comprehensive income (loss), net of tax	0.8	(23.6)	(5.5)	(13.5)
Comprehensive income (loss)	$ 26.5	$ (0.1)	$ 30.6	$ 13.6