Pensions and Other Postretirement Benefits - Multi-employer Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company contributions	$ 0.2	$ 0.5	$ 0.6
Central States Southeast and Southwest Areas Pension Fund
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company contributions	$ 0.1	$ 0.1	0.1
Pension Protection Act Zone Status	Red	Red
PIUMPF
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company contributions	$ 0.0	$ 0.3	0.4
Pension Protection Act Zone Status	Red	Red
Western Conference of Teamsters Pension Trust - Northwest Area
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company contributions	$ 0.1	$ 0.1	$ 0.1
Pension Protection Act Zone Status	Green	Green