Accumulated Other Comprehensive (Loss) Income, Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017		Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive (loss) income before reclassifications	[1]			$ (20.7)		$ 53.1
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			6.8		7.6
Total other comprehensive (loss) income, net of tax		$ (60.1)	$ 35.6	(13.9)	[1]	60.7	[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]	(213.4)	(281.7)	(213.4)		(281.7)
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]			(48.1)		89.9
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			0.0		0.0
Total other comprehensive (loss) income, net of tax	[1]			(48.1)		89.9
Balance at end of period	[1]	(214.7)	(234.3)	(214.7)		(234.3)
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]			15.0		(29.4)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			0.0		0.0
Total other comprehensive (loss) income, net of tax	[1]			15.0		(29.4)
Balance at end of period	[1]	52.0	59.2	52.0		59.2
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]			10.1		(4.6)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			6.0		6.1
Total other comprehensive (loss) income, net of tax	[1]			16.1		1.5
Balance at end of period	[1]	(13.4)	(40.7)	(13.4)		(40.7)
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]			2.3		(2.8)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]			0.8		1.5
Total other comprehensive (loss) income, net of tax	[1]			3.1		(1.3)
Balance at end of period	[1]	$ (37.3)	$ (65.9)	$ (37.3)		$ (65.9)
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.