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Income Taxes - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income tax provision $ 3.1us-gaap_IncomeTaxExpenseBenefit $ 1.4us-gaap_IncomeTaxExpenseBenefit $ 1.4us-gaap_IncomeTaxExpenseBenefit
Liability for unremitted foreign earnings included in income tax expense 1.7us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Cash paid for income taxes $ 4.7us-gaap_IncomeTaxesPaidNet $ 4.6us-gaap_IncomeTaxesPaidNet $ 4.4us-gaap_IncomeTaxesPaidNet