Restructuring Costs and Other - Reserve (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18			$ 20.9
Pre-tax Restructuring Costs	$ 0.0	$ 4.8	0.7	$ 10.2
Utilization and Foreign Exchange			(4.7)
Ending Accrued Restructuring Balance 6/30/2018	16.9		16.9
2018 Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18			0.0
Pre-tax Restructuring Costs			1.3
Utilization and Foreign Exchange			(0.5)
Ending Accrued Restructuring Balance 6/30/2018	0.8		0.8
2018 Restructuring Actions | Severance
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18			0.0
Pre-tax Restructuring Costs			0.8
Utilization and Foreign Exchange			(0.1)
Ending Accrued Restructuring Balance 6/30/2018	0.7		0.7
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 6/30/2018	0.0		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			0.5
Utilization and Foreign Exchange			(0.4)
Ending Accrued Restructuring Balance 6/30/2018	0.1		0.1
2018 Restructuring Actions | Withdrawal from Multiemployer Defined Benefit Plan
Restructuring Reserve [Roll Forward]
Ending Accrued Restructuring Balance 6/30/2018	12.5		12.5
2017 and Prior Restructuring Actions
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18			20.9
Pre-tax Restructuring Costs			(0.6)
Utilization and Foreign Exchange			(4.2)
Ending Accrued Restructuring Balance 6/30/2018	16.1		16.1
2017 and Prior Restructuring Actions | Severance
Restructuring Reserve [Roll Forward]
Beginning Accrued Restructuring Balance 1/1/18			5.4
Pre-tax Restructuring Costs			(1.3)
Utilization and Foreign Exchange			(1.9)
Ending Accrued Restructuring Balance 6/30/2018	2.2		2.2
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 6/30/2018	0.0		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			0.7
Utilization and Foreign Exchange			(2.3)
Ending Accrued Restructuring Balance 6/30/2018	$ 13.9		$ 13.9