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Acquisition (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 01, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Total purchase price consideration   $ 102.0 $ 0.0 $ 0.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]        
Total purchase price consideration   102.0 0.0 $ 0.0
Goodwill   862.0 $ 840.0  
Continuum Energy Services [Member]        
Total purchase price consideration $ 102.0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]        
Total purchase price consideration 102.0      
Receivables 76.0      
Derivative assets 38.0      
Property and equipment 1.0      
Identifiable intangibles 38.0      
Total assets acquired 153.0      
Accounts payable 49.0      
Derivative liabilities 24.0      
Total liabilities assumed 73.0      
Identifiable net assets acquired 80.0      
Goodwill 22.0      
Net assets acquired 102.0      
Amortization of Intangible Assets   3.0    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   466.0    
Business Combination, Operating Income Of Acquiree Since Acquisition Date   $ 1.0    
Continuum Energy Services [Member] | Customer Relationships [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]        
Finite-lived Intangible Assets Acquired $ 34.0      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years      
Continuum Energy Services [Member] | Noncompete Agreements [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]        
Finite-lived Intangible Assets Acquired $ 4.0      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years