Restructuring Costs - Reserve (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	$ 17.4
Pre-tax Restructuring Costs	24.1	$ 32.0	$ 12.0
Utilization and Foreign Exchange	(30.9)
Ending accrued restructuring balance	10.6	17.4
2020 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	18.4
Utilization and Foreign Exchange	(12.4)
Ending accrued restructuring balance	6.0	0.0
2019 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	17.4
Pre-tax Restructuring Costs	5.7
Utilization and Foreign Exchange	(18.5)
Ending accrued restructuring balance	4.6	17.4
Severance | 2020 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	11.1
Utilization and Foreign Exchange	(5.2)
Ending accrued restructuring balance	5.9	0.0
Severance | 2019 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	11.3
Pre-tax Restructuring Costs	(1.1)
Utilization and Foreign Exchange	(7.2)
Ending accrued restructuring balance	3.0	11.3
Asset write-downs | 2020 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	4.6
Utilization and Foreign Exchange	(4.6)
Ending accrued restructuring balance	0.0	0.0
Asset write-downs | 2019 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	0.5
Utilization and Foreign Exchange	(0.5)
Ending accrued restructuring balance	0.0	0.0
Facility closure and other costs | 2020 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	2.7
Utilization and Foreign Exchange	(2.6)
Ending accrued restructuring balance	0.1	0.0
Facility closure and other costs | 2019 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	6.1
Pre-tax Restructuring Costs	6.3
Utilization and Foreign Exchange	(10.8)
Ending accrued restructuring balance	$ 1.6	$ 6.1