Accumulated Other Comprehensive (Loss) Income, Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period				$ 265.9
Other comprehensive income (loss) before reclassifications	[1]			79.8		$ (11.7)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			10.9		6.5
Total other comprehensive income (loss), net of tax		$ 30.1	$ (18.9)	90.7	[1]	(5.2)	[1]
Balance at end of period		1,271.8		1,271.8
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	[1]			(342.4)		(265.6)
Balance at end of period	[1]	(251.7)	(270.8)	(251.7)		(270.8)
Cumulative Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	[1]			(324.2)		(248.0)
Other comprehensive income (loss) before reclassifications	[1]			131.4		12.8
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			0.0		0.0
Total other comprehensive income (loss), net of tax	[1]			131.4		12.8
Balance at end of period	[1]	(192.8)	(235.2)	(192.8)		(235.2)
Foreign Currency Gains and (Losses) [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	[1]			88.6		75.0
Other comprehensive income (loss) before reclassifications	[1]			(44.3)		(10.8)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			0.0		0.0
Total other comprehensive income (loss), net of tax	[1]			(44.3)		(10.8)
Balance at end of period	[1]	44.3	64.2	44.3		64.2
Unrealized (Losses) Gains on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	[1]			(42.2)		(41.3)
Other comprehensive income (loss) before reclassifications	[1]			(3.1)		(18.5)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			8.6		5.0
Total other comprehensive income (loss), net of tax	[1]			5.5		(13.5)
Balance at end of period	[1]	(36.7)	(54.8)	(36.7)		(54.8)
Pension and Postretirement Benefit Plans [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	[1]			(64.6)		(51.3)
Other comprehensive income (loss) before reclassifications	[1]			(4.2)		4.8
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			2.3		1.5
Total other comprehensive income (loss), net of tax	[1]			(1.9)		6.3
Balance at end of period	[1]	$ (66.5)	$ (45.0)	$ (66.5)		$ (45.0)

[1] All amounts are net of tax. Amounts in parentheses indicate debits.