Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	$ 1,108.6	$ 1,204.0	$ 3,148.1	$ 3,487.7
Cost of goods sold	779.0	842.0	2,224.5	2,461.0
Total before tax	139.0	168.0	351.9	389.6
Other expense, net	(2.3)	(9.6)	(8.9)	(18.2)
Tax benefit (expense)	(30.4)	(35.4)	(78.5)	(85.3)
Gain (loss) net of tax	108.6	132.6	273.4	304.3
Gain on disposition of business (Note 1)	0.0	21.7	0.0	21.7
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (loss) net of tax	(6.5)	4.1	(9.4)	1.3
Cash flow hedges gain (loss): | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	0.0	0.1	0.3	0.4
Cost of goods sold	0.2	0.0	0.7	0.5
Total before tax	0.2	0.1	1.0	0.9
Tax benefit (expense)	(0.1)	0.0	(0.3)	(0.2)
Gain (loss) net of tax	0.1	0.1	0.7	0.7
Defined benefit pension and post-retirement benefit items: | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	(8.9)	(2.6)	(13.5)	(7.1)
Tax benefit (expense)	2.3	0.7	3.4	1.8
Gain (loss) net of tax	(6.6)	(1.9)	(10.1)	(5.3)
Prior-service costs | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	0.1	0.1	0.2	0.5
Actuarial gains/(losses) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	(2.4)	(2.4)	(7.1)	(7.3)
Settlement and curtailment losses | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	(6.6)	(0.3)	(6.6)	(0.3)
Reclassification of gains (losses) on available-for-sale securities: | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other expense, net	0.0	(1.8)	0.0	(1.8)
Tax benefit (expense)	0.0	0.0	0.0	0.0
Gain (loss) net of tax	0.0	(1.8)	0.0	(1.8)
Reclassification of currency translation gain: | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax benefit (expense)	0.0	0.0	0.0	0.0
Gain (loss) net of tax	0.0	7.7	0.0	7.7
Gain on disposition of business (Note 1)	$ 0.0	$ 7.7	$ 0.0	$ 7.7