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Guarantees and Indemnifications (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Guarantee Of Financial Obligations Of Npt [Member]
 
Guarantee Obligations [Line Items]  
Guarantee Obligations Maximum Exposure $ 25.0
Various Subsidiary Surety Bonds And Performance Guarantees Expiring Between 2013 And 2015 [Member]
 
Guarantee Obligations [Line Items]  
Guarantee Obligations Maximum Exposure 69.2
Guarantee Of Rocky River Reality And Nusco Lease Payments For Real Estate And Vehicles Expiring 2019 Through 2024 [Member]
 
Guarantee Obligations [Line Items]  
Guarantee Obligations Maximum Exposure 17.7
Guarantee Of Debt Of Ne Hydros [Member]
 
Guarantee Obligations [Line Items]  
Guarantee Obligations Maximum Exposure $ 3.5