Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017
Document Period End Date						Jun. 30, 2018
Beginning Balance		$ (205.5)		$ (296.4)		$ (196.3)		$ (341.3)
Other comprehensive (loss) income before reclassifications (1)		(70.6)		83.3		(53.0)		132.4
Amounts reclassified from AOCI		2.6		0.8		4.8		(3.4)
Net current-period other comprehensive (loss) income		(68.0)		84.1		(77.2)		129.0
Balance at March 31		(273.5)		(212.3)		(273.5)		(212.3)
Translation adjustment
Beginning Balance		(107.7)		(201.9)		(116.8)		(251.2)
Other comprehensive (loss) income before reclassifications (1)		(79.8)	[1]	78.2	[2]	(61.6)	[3]	127.5	[4]
Amounts reclassified from AOCI		0.0		0.0		0.0		0.0
Net current-period other comprehensive (loss) income		(79.8)		78.2		(70.7)		127.5
Balance at March 31		(187.5)		(123.7)		(187.5)		(123.7)
Translation adjustment | Accounting Standards Update 2018-02
Adoption of accounting standards	[5]					(9.1)
Foreign Currency Hedges
Beginning Balance		(8.9)		(7.9)		(5.1)		(5.7)
Other comprehensive (loss) income before reclassifications (1)		8.7		5.6		5.9		3.4
Amounts reclassified from AOCI		0.0		0.0		0.0		0.0
Net current-period other comprehensive (loss) income		8.7		5.6		4.9		3.4
Balance at March 31		(0.2)		(2.3)		(0.2)		(2.3)
Foreign Currency Hedges | Accounting Standards Update 2018-02
Adoption of accounting standards	[5]					(1.0)
Interest Rate Hedges
Beginning Balance		12.0		6.3		8.1		4.6
Other comprehensive (loss) income before reclassifications (1)		0.5		(0.5)		2.7		1.5
Amounts reclassified from AOCI		0.8		(0.1)		1.2		(0.4)
Net current-period other comprehensive (loss) income		1.3		(0.6)		5.2		1.1
Balance at March 31		13.3		5.7		13.3		5.7
Interest Rate Hedges | Accounting Standards Update 2018-02
Adoption of accounting standards	[5]					1.3
Pension and Other Post-retirement Benefits
Beginning Balance		(101.0)		(93.2)		(82.6)		(89.3)
Other comprehensive (loss) income before reclassifications (1)		0.0		0.0		0.0		0.0
Amounts reclassified from AOCI		1.8		0.9		3.6		(3.0)
Net current-period other comprehensive (loss) income		1.8		0.9		(16.6)		(3.0)
Balance at March 31		(99.2)		(92.3)		(99.2)		(92.3)
Pension and Other Post-retirement Benefits | Accounting Standards Update 2018-02
Adoption of accounting standards	[5]					(20.2)
Other
Beginning Balance		0.1		0.3		0.1		0.3
Other comprehensive (loss) income before reclassifications (1)		0.0		0.0		0.0		0.0
Amounts reclassified from AOCI		0.0		0.0		0.0		0.0
Net current-period other comprehensive (loss) income		0.0		0.0		0.0		0.0
Balance at March 31		0.1		0.3		0.1		0.3
Other | Accounting Standards Update 2018-02
Adoption of accounting standards	[5]					0.0
AOCI Attributable to Parent | Accounting Standards Update 2018-02
Adoption of accounting standards		0.0	[5]	0.0		(29.0)	[5]	0.0
Translation adjustment
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest		$ (1.5)		$ 1.7		$ (1.5)		$ 1.7

[1] (1)Other comprehensive income (loss) before reclassifications within the translation component excludes $(1.5) of translation attributable to noncontrolling interests.

[2] (1)Other comprehensive income (loss) before reclassifications within the translation component excludes $1.7 of translation attributable to noncontrolling interests.

[3] (2) Other comprehensive income (loss) before reclassifications within the translation component excludes $(1.5) of translation attributable to noncontrolling interests.

[4] (1)Other comprehensive income (loss) before reclassifications within the translation component excludes $1.7 of translation attributable to noncontrolling interests.

[5] (1)Stranded tax effects reclassified from AOCI to retained earnings from the adoption of ASU 2018-02.