Employee Benefit Plans - Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		7.00%
Defined Benefit Plan, Other Information	10.00%
Defined Benefit Plan, Ultimate Trend Rate	5.00%
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]	$ 0.2
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan Plans With Plan Assets In Excess Of Accumulated Benefit Obligations Aggregate Projected Benefit Obligation	1.0	$ 4.0
Defined Benefit Plan Plans With Plan Assets In Excess Of Accumulated Benefit Obligations Aggregate Accumulated Benefit Obligation	1.0	4.0
Defined Benefit Plan Plans With Plan Assets In Excess Of Accumulated Benefit Obligations Aggregate Fair Value Of Plan Assets	$ 0.0	$ 0.0
Qualified Pension Plan [Member]
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	0.00%	4.35%		4.05%
Pension Plan, Defined Benefit [Member]
Pension and PBO - Additional Information [Abstract]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements			$ 6.0
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan, Benefit Obligation	$ 1.0	$ 4.0
Defined Benefit Plan, Actuarial Gain (Loss)	0.0	0.0
Defined Benefit Plan, Benefits Paid	3.0	0.0
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0
Defined Benefit Plan, Contributions by Employer	(3.0)	0.0
Defined Benefit Plan, Funded Status of Plan	(1.0)	(4.0)
Defined Benefit Plan Accumulated Other Comprehensive Income Gross Unrecognized Cost	0.0	0.0
Defined Benefit Plan, Amounts Recognized in Balance Sheet	(1.0)	(4.0)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	0.0	0.0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	(1.0)	(1.0)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(1.0)	$ (1.0)
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 1.0
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.55%	3.75%
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan, Benefit Obligation	$ 3.0	$ 4.0		$ 5.0
Defined Benefit Plan, Actuarial Gain (Loss)	(1.0)	(1.0)
Defined Benefit Plan, Benefits Paid	0.0	0.0
Defined Benefit Plan, Fair Value of Plan Assets	0.0	0.0		$ 0.0
Defined Benefit Plan, Contributions by Employer	0.0	0.0
Defined Benefit Plan, Funded Status of Plan	(3.0)	(4.0)
Defined Benefit Plan Accumulated Other Comprehensive Income Gross Unrecognized Cost	0.0	0.0
Defined Benefit Plan, Amounts Recognized in Balance Sheet	(3.0)	(4.0)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(4.0)	(4.0)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax	0.0	0.0
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	$ (4.0)	$ (4.0)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.75%	3.50%
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	$ 2.0
Qualified Pension Plan [Member]
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.35%	4.05%
Medicare Part D [Member]
Defined Benefit Plan, Funded Status of Plan [Abstract]
Future Benefits Payable Attributable to Medicare Part D Subsidy	$ 0.0
Annuity Payment [Member] | Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Funded Status of Plan [Abstract]
Defined Benefit Plan, Benefits Paid			$ 35.0