Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Beginning Balance		$ (341.3)	$ (318.1)
Other comprehensive (loss) income before reclassifications (1)		142.1	(23.0)
Amounts reclassified from AOCI		2.9	(0.2)
Net current period other comprehensive income (loss)		145.0	(23.2)
Ending Balance		(196.3)	(341.3)
Translation
Beginning Balance		(251.2)	(215.6)
Other comprehensive (loss) income before reclassifications (1)	[1]	134.4	(35.6)
Amounts reclassified from AOCI		0.0	0.0
Net current period other comprehensive income (loss)		134.4	(35.6)
Ending Balance		(116.8)	(251.2)
Other comprehensive (loss) income before reclassifications within the translation component, amount excluded		(5.9)	(3.2)
Foreign Currency Hedges
Beginning Balance		(5.7)	5.0
Other comprehensive (loss) income before reclassifications (1)		0.6	(10.7)
Amounts reclassified from AOCI		0.0	0.0
Net current period other comprehensive income (loss)		0.6	(10.7)
Ending Balance		(5.1)	(5.7)
Interest Rate Hedges
Beginning Balance		4.6	(0.1)
Other comprehensive (loss) income before reclassifications (1)		3.9	4.9
Amounts reclassified from AOCI		(0.4)	(0.2)
Net current period other comprehensive income (loss)		3.5	4.7
Ending Balance		8.1	4.6
Pension and Other Post-Retirement Benefits
Beginning Balance		(89.3)	(107.8)
Other comprehensive (loss) income before reclassifications (1)		3.4	18.5
Amounts reclassified from AOCI		3.3	0.0
Net current period other comprehensive income (loss)		6.7	18.5
Ending Balance		(82.6)	(89.3)
Other
Beginning Balance		0.3	0.4
Other comprehensive (loss) income before reclassifications (1)		(0.2)	(0.1)
Amounts reclassified from AOCI		0.0	0.0
Net current period other comprehensive income (loss)		(0.2)	(0.1)
Ending Balance		$ 0.1	$ 0.3

[1] Other comprehensive income (loss) before reclassifications within the translation component excludes (gains)/losses of $(5.9) and $(3.2) and translation attributable to noncontrolling interests for December 31, 2017 and 2016, respectively.