Restructuring Costs - Reserve (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	$ 20.9
Pre-tax Restructuring Costs	12.0	$ 20.3	$ 35.0
Utilization and Foreign Exchange	(11.9)
Ending accrued restructuring balance	21.0	20.9
2018 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	12.7
Utilization and Foreign Exchange	(5.8)
Ending accrued restructuring balance	6.9	0.0
2017 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	20.9
Pre-tax Restructuring Costs	(0.7)
Utilization and Foreign Exchange	(6.1)
Ending accrued restructuring balance	14.1	20.9
Severance | 2018 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	8.8
Utilization and Foreign Exchange	(2.0)
Ending accrued restructuring balance	6.8	0.0
Severance | 2017 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	5.4
Pre-tax Restructuring Costs	(2.3)
Utilization and Foreign Exchange	(2.2)
Ending accrued restructuring balance	0.9	5.4
Asset write-downs | 2018 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	0.4
Utilization and Foreign Exchange	(0.4)
Ending accrued restructuring balance	0.0	0.0
Asset write-downs | 2017 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	0.0
Utilization and Foreign Exchange	0.0
Ending accrued restructuring balance	0.0	0.0
Facility closure and other costs | 2018 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	0.0
Pre-tax Restructuring Costs	3.5
Utilization and Foreign Exchange	(3.4)
Ending accrued restructuring balance	0.1	0.0
Facility closure and other costs | 2017 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning accrued restructuring balance	15.5
Pre-tax Restructuring Costs	1.6
Utilization and Foreign Exchange	(3.9)
Ending accrued restructuring balance	$ 13.2	$ 15.5