Restructuring Costs and Other - Reserve (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	$ 20.9
Pre-tax Restructuring Costs	0.7	$ 5.5
Utilization and Foreign Exchange	(2.7)
Ending Accrued Restructuring Balance 3/31/2018	18.9
2018 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	0.0
Pre-tax Restructuring Costs	0.3
Utilization and Foreign Exchange	0.0
Ending Accrued Restructuring Balance 3/31/2018	0.3
2018 Restructuring Actions | Severance
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	0.0
Pre-tax Restructuring Costs	0.2
Utilization and Foreign Exchange	0.0
Ending Accrued Restructuring Balance 3/31/2018	0.2
2018 Restructuring Actions | Asset write-downs
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	0.0
Pre-tax Restructuring Costs	0.0
Utilization and Foreign Exchange	0.0
Ending Accrued Restructuring Balance 3/31/2018	0.0
2018 Restructuring Actions | Facility closure and other costs
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	0.0
Pre-tax Restructuring Costs	0.1
Utilization and Foreign Exchange	0.0
Ending Accrued Restructuring Balance 3/31/2018	0.1
2018 Restructuring Actions | Withdrawal from Multiemployer Defined Benefit Plan
Restructuring Reserve [Roll Forward]
Pre-tax Restructuring Costs	12.5
2017 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	20.9
Pre-tax Restructuring Costs	0.4
Utilization and Foreign Exchange	(2.7)
Ending Accrued Restructuring Balance 3/31/2018	18.6
2017 and Prior Restructuring Actions | Severance
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	5.4
Pre-tax Restructuring Costs	(0.2)
Utilization and Foreign Exchange	(1.0)
Ending Accrued Restructuring Balance 3/31/2018	4.2
2017 and Prior Restructuring Actions | Asset write-downs
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	0.0
Pre-tax Restructuring Costs	0.0
Utilization and Foreign Exchange	0.0
Ending Accrued Restructuring Balance 3/31/2018	0.0
2017 and Prior Restructuring Actions | Facility closure and other costs
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18	15.5
Pre-tax Restructuring Costs	0.6
Utilization and Foreign Exchange	(1.7)
Ending Accrued Restructuring Balance 3/31/2018	$ 14.4