Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	$ 949.2	$ 1,196.4	$ 2,039.5	$ 2,283.7
Cost of goods sold	668.7	839.0	1,445.5	1,619.0
Total before tax	113.0	123.6	212.9	221.6
Tax benefit (expense)	(23.9)	(25.7)	(48.1)	(49.9)
Gain (loss) net of tax	89.1	97.9	164.8	171.7
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (loss) net of tax	(1.4)	(1.6)	(2.9)	(2.8)
Cash flow hedge (loss) gain | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net sales	0.2	0.1	0.3	0.3
Cost of goods sold	0.3	0.2	0.5	0.5
Total before tax	0.5	0.3	0.8	0.8
Tax benefit (expense)	(0.1)	0.0	(0.2)	(0.2)
Gain (loss) net of tax	0.4	0.3	0.6	0.6
Pension and post retirement benefit plan adjustment | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	(2.3)	(2.5)	(4.6)	(4.5)
Tax benefit (expense)	0.5	0.6	1.1	1.1
Gain (loss) net of tax	(1.8)	(1.9)	(3.5)	(3.4)
Prior-service costs | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	0.0	0.2	0.1	0.4
Actuarial gains/(losses) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	$ (2.3)	$ (2.7)	$ (4.7)	$ (4.9)