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Acquisitions (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Customer Relationships [Member]  
Business Acquisition [Abstract]  
Finite-lived Intangible Assets Acquired $ 8.3us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 9 years
Contract based  
Business Acquisition [Abstract]  
Finite-lived Intangible Assets Acquired 4.4us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 43 years
Other Intangible Assets [Member]  
Business Acquisition [Abstract]  
Finite-lived Intangible Assets Acquired $ 0.4us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2 years