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Other Employee Benefit Plans Other Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
401(k) matching contributions $ 6.9us-gaap_DefinedContributionPlanCostRecognized $ 4.9us-gaap_DefinedContributionPlanCostRecognized $ 5.8us-gaap_DefinedContributionPlanCostRecognized
Pension liability $ 3.6us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent $ 3.4us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent