Accumulated Other Comprehensive (Loss) Income, Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017		Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive (loss) income before reclassifications	[1]			$ (37.0)		$ 79.8
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			10.1		10.9
Total other comprehensive (loss) income, net of tax		$ (13.0)	$ 30.1	(26.9)	[1]	90.7	[1]
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]			(199.8)		(342.4)
Balance at end of period	[1]	(226.4)	(251.7)	(226.4)		(251.7)
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2017-12 [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2017-12)	[1]							$ 0.3
Cumulative Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]			(166.6)		(324.2)
Other comprehensive (loss) income before reclassifications	[1]			(70.0)		131.4
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			0.0		0.0
Total other comprehensive (loss) income, net of tax	[1]			(70.0)		131.4
Balance at end of period	[1]	(236.6)	(192.8)	(236.6)		(192.8)
Cumulative Currency Translation Adjustment [Member] | ASU 2017-12 [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2017-12)	[1]							0.0
Foreign Currency Gains and (Losses) [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]			37.0		88.6
Other comprehensive (loss) income before reclassifications	[1]			18.7		(44.3)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			0.0		0.0
Total other comprehensive (loss) income, net of tax	[1]			18.7		(44.3)
Balance at end of period	[1]	55.7	44.3	55.7		44.3
Foreign Currency Gains and (Losses) [Member] | ASU 2017-12 [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2017-12)	[1]							0.0
Unrealized (Losses) Gains on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]			(29.8)		(42.2)
Other comprehensive (loss) income before reclassifications	[1]			11.5		(3.1)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			9.0		8.6
Total other comprehensive (loss) income, net of tax	[1]			20.5		5.5
Balance at end of period	[1]	(9.0)	(36.7)	(9.0)		(36.7)
Unrealized (Losses) Gains on Cash Flow Hedges [Member] | ASU 2017-12 [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2017-12)	[1]							0.3
Pension and Postretirement Benefit Plans [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]			(40.4)		(64.6)
Other comprehensive (loss) income before reclassifications	[1]			2.8		(4.2)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			1.1		2.3
Total other comprehensive (loss) income, net of tax	[1]			3.9		(1.9)
Balance at end of period	[1]	$ (36.5)	$ (66.5)	$ (36.5)		$ (66.5)
Pension and Postretirement Benefit Plans [Member] | ASU 2017-12 [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2017-12)	[1]							$ 0.0

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