Accumulated Other Comprehensive (Loss) Income, Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive (loss) income before reclassifications	[1]	$ (60.4)	$ 128.0	$ (85.9)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	12.9	14.6	9.1
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]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.3
Accumulated Other Comprehensive Income [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [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]
Changes in Accumulated Other Comprehensive Income (Loss) [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]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	(129.6)	(235.6)	(173.0)
Other comprehensive (loss) income before reclassifications	[1]	(61.0)	106.0	(62.6)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	0.0	0.0	0.0
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]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standard (ASU 2017-12)		0.0
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	(29.8)	(42.2)	(41.3)
Other comprehensive (loss) income before reclassifications	[1]	6.6	0.9	(8.1)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	11.5	11.5	7.2
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 Gains (Losses) 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)		0.3
Pension and Postretirement Benefit Plans [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	[1]	(40.4)	(64.6)	(51.3)
Other comprehensive (loss) income before reclassifications	[1]	(6.0)	21.1	(15.2)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	1.4	3.1	1.9
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]
Changes in Accumulated Other Comprehensive Income (Loss) [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.