Pensions and Postretirement Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Annual supplemental retirement benefit	$ 0.4
Vested retirement benefit credited service maximum period, prior to January 1, 2008	13 years
Vested retirement benefit credited service maximum period, on or after January 1, 2008	7 years
Vested retirement benefit credited service period	20 years
Percentage of Supplemental Pension received	100.00%
SERP Expense	$ (0.2)	$ 0.6	$ 0.5
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Reductions in service costs	0.1
Reductions in interest costs	0.5
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Reductions in interest costs	0.1
Estimated net loss	1.1
Estimated prior service cost	$ 0.1
Minimum | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Spot rates used to determine service and interest costs	3.29%
Minimum | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Spot rates used to determine service and interest costs		2.93%
Reductions in service costs	$ 0.0
Maximum | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Spot rates used to determine service and interest costs	4.19%
Maximum | Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Spot rates used to determine service and interest costs		4.43%