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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Entity Information [Line Items]      
Notes Receivable $ 432.2 $ 523.6  
Notes payable 0 90.0  
Capitalized interest (1.6) (0.2) 0.1
Amortization of financing costs and discounts 1.4 1.5 2.6
Maximum
     
Entity Information [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
Percentage Used To Determine Noncontrolling Interest Presentation 1.00    
Minimum
     
Entity Information [Line Items]      
Equity Method Investment, Ownership Percentage 20.00%    
Percentage Used To Determine Noncontrolling Interest Presentation 0.50    
All Customers [Member] [Member]
     
Entity Information [Line Items]      
Concentration Risk, Percentage 44.00% 46.00% 48.00%
Home Depot [Member]
     
Entity Information [Line Items]      
Concentration Risk, Percentage   10.00%  
Non recourse notes payable 2018
     
Entity Information [Line Items]      
Notes payable 368.7 368.7  
Deferred loss on early debt extinguishment
     
Entity Information [Line Items]      
Write off of Deferred Debt Issuance Cost 1.4 4.5  
Senior Notes 2018 [Member]
     
Entity Information [Line Items]      
Notes Receivable $ 410.0 $ 410.0