Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Rate	Dec. 31, 2013 Rate	Dec. 31, 2012 Rate
Actuarial assumption used to calculate benefit obligation, expected rate of return on assets	4.00%	4.00%	6.00%
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	$ (4)	$ (2)
Current Fiscal Year End Date	--12-31
Defined Benefit Plan, Accumulated Benefit Obligation	8	6
Defined Benefit Plan, Fair Value of Plan Assets	4	4
Defined Benefit Plan, Contributions by Employer	0.1	0.2
Defined Contribution Plan, Cost Recognized	11	11	8
Defined Benefit Plan, Net Periodic Benefit Cost	0.4	0.4	0.3
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	$ 0.3
Actualrial Assumptions used to calulate benefit obligation, discount rate	3.80%	4.70%