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Tax Years Open to Examinations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Income Tax Contingency  
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound 35.0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound
Maximum [Member] | Domestic Tax Authority  
Income Tax Contingency  
Open Tax Year 2010
Minimum | Domestic Tax Authority  
Income Tax Contingency  
Open Tax Year 2009
Minimum | State and Local Jurisdiction  
Income Tax Contingency  
Open Tax Year 2004
Minimum | Foreign Tax Authority  
Income Tax Contingency  
Open Tax Year 2006