Restructuring Costs and Other Restructuring Costs and Other - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4.8		$ 3.7	$ 10.2	$ 9.5
Multiemployer plans, withdrawal obligation, settlement term		19 years
Restructuring Actions 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 6.5
Withdrawal from Multiemployer Defined Benefit Plan | Restructuring Actions 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 12.5