Accumulated Other Comprehensive (Loss) Income, Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income (loss) before reclassifications	[1]	$ 42.2	$ 21.1
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	4.0	3.9
Total other comprehensive income, net of tax	[1]	46.2	25.0
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]	(153.3)	(317.4)
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 income (loss) before reclassifications	[1]	51.4	25.7
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	0.0	0.0
Total other comprehensive income, net of tax	[1]	51.4	25.7
Balance at end of period	[1]	(115.2)	(298.5)
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 income (loss) before reclassifications	[1]	(17.0)	(3.9)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	0.0	0.0
Total other comprehensive income, net of tax	[1]	(17.0)	(3.9)
Balance at end of period	[1]	20.0	84.7
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 income (loss) before reclassifications	[1]	7.8	(0.2)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	3.6	3.2
Total other comprehensive income, net of tax	[1]	11.4	3.0
Balance at end of period	[1]	(18.1)	(39.2)
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 income (loss) before reclassifications	[1]	0.0	(0.5)
Amounts reclassified from accumulated other comprehensive income (loss)	[1]	0.4	0.7
Total other comprehensive income, net of tax	[1]	0.4	0.2
Balance at end of period	[1]	$ (40.0)	$ (64.4)
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.