Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Net sales	$ 1,204.0	$ 1,179.7	$ 3,487.7	$ 3,337.6
Cost of goods sold	(842.0)	(830.7)	(2,461.0)	(2,357.8)
Total before tax	168.0	142.5	389.6	352.3
Tax benefit (expense)	(35.4)	(27.8)	(85.3)	(75.4)
Gain (loss) net of tax			1.3
Other expense, net	(9.6)	(2.9)	(18.2)	(13.5)
Gain on sale of business	21.7	0.0	21.7	0.0
Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Tax benefit (expense)	0.0	0.0	0.0	0.0
Gain (loss) net of tax	(1.8)	0.0	(1.8)	0.0
Gain (loss) net of tax	4.1	(1.7)	1.3	(5.8)
Other expense, net	(1.8)	0.0	(1.8)	0.0
Cash flow hedge (loss) gain
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Gain (loss) net of tax			0.7
Prior-service costs (a)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Amortization of defined benefit pension and post retirement benefit items	0.1	0.2	0.5	0.7
Actuarial gains/(losses) (a)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Amortization of defined benefit pension and post retirement benefit items	(2.4)	(2.6)	(7.3)	(8.2)
Settlement and curtailment losses (a)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Amortization of defined benefit pension and post retirement benefit items	(0.3)	0.0	(0.3)	0.0
Pension and post retirement benefit plan adjustment
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Amortization of defined benefit pension and post retirement benefit items	(2.6)	(2.4)	(7.1)	(7.5)
Tax benefit (expense)	0.7	0.5	1.8	1.7
Gain (loss) net of tax	(1.9)	(1.9)	(5.3)	(5.8)
Reclassification of currency translation gain | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Tax benefit (expense)	0.0	0.0	0.0	0.0
Gain (loss) net of tax	7.7	0.0	7.7	0.0
Gain on sale of business	7.7	0.0	7.7	0.0
Forward Contracts | Cash flow hedge (loss) gain | Reclassification out of Accumulated Other Comprehensive Income
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Net sales	0.1	0.1	0.4	0.0
Cost of goods sold	0.0	0.2	0.5	0.0
Total before tax	0.1	0.3	0.9	0.0
Tax benefit (expense)	0.0	(0.1)	(0.2)	0.0
Gain (loss) net of tax	$ 0.1	$ 0.2	$ 0.7	$ 0.0