Accumulated Other Comprehensive (Loss) Income, Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income [Roll Forward]
Before tax (loss) income		$ (36.7)	$ 124.6	$ (71.0)
Income tax effect		(10.8)	18.0	(5.8)
Other comprehensive (loss) income, net of tax	[1]	(47.5)	142.6	(76.8)
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.3
ASU 2017-12 [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.3
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	[1]	(199.8)	(342.4)	(265.6)
Ending balance	[1]	(247.0)	(199.8)	(342.4)
Accumulated Other Comprehensive Income [Member] | ASU 2017-12 [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.3	0.0	0.0
Cumulative Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	[1]	(129.6)	(235.6)	(173.0)
Before tax (loss) income		(54.3)	74.8	(55.2)
Income tax effect		(6.7)	31.2	(7.4)
Other comprehensive (loss) income, net of tax	[1]	(61.0)	106.0	(62.6)
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.0
Ending balance	[1]	(190.6)	(129.6)	(235.6)
Cumulative Currency Translation Adjustment [Member] | ASU 2017-12 [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.0
Unrealized (Losses) Gains on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	[1]	(29.8)	(42.2)	(41.3)
Before tax (loss) income		25.3	20.0	(1.5)
Income tax effect		(7.2)	(7.6)	0.6
Other comprehensive (loss) income, net of tax	[1]	18.1	12.4	(0.9)
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.3
Ending balance	[1]	(11.4)	(29.8)	(42.2)
Unrealized (Losses) Gains on Cash Flow Hedges [Member] | ASU 2017-12 [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.3
Pension and Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	[1]	(40.4)	(64.6)	(51.3)
Before tax (loss) income		(7.7)	29.8	(14.3)
Income tax effect		3.1	(5.6)	1.0
Other comprehensive (loss) income, net of tax	[1]	(4.6)	24.2	(13.3)
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.0
Ending balance	[1]	(45.0)	$ (40.4)	$ (64.6)
Pension and Postretirement Benefit Plans [Member] | ASU 2017-12 [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		$ 0.0

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