Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Examination [Line Items]
Federal corporate tax rate	35.00%	35.00%	35.00%
Increase (decrease) in net liability for unrecognized tax benefits	$ (1.0)	$ (0.6)
Accrued interest expense	0.2	0.2
Unrecognized tax benefits that would impact our effective tax rate	3.9	5.0
Interest included in total liability	1.1	$ 1.4
Significant increases or decreases for uncertain tax positions	$ 0.0
State and Foreign Tax Authorities | Minimum
Income Tax Examination [Line Items]
Period of statute of limitations (years)	3 years
State and Foreign Tax Authorities | Maximum
Income Tax Examination [Line Items]
Period of statute of limitations (years)	4 years