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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Entity Information [Line Items]      
Notes Receivable   $ 432.2  
Capitalized interest $ 1.9 1.3 $ 1.6
Write off of Deferred Debt Issuance Cost     1.4
Amortization of financing costs and discounts $ 1.1 $ 1.2 $ 1.4
Maximum      
Entity Information [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
Minimum      
Entity Information [Line Items]      
Equity Method Investment, Ownership Percentage 20.00%    
All Customers [Member] [Member]      
Entity Information [Line Items]      
Concentration Risk, Percentage 45.00% 41.00% 44.00%
Home Depot [Member]      
Entity Information [Line Items]      
Concentration Risk, Percentage   10.00%  
Senior Notes 2018 [Member]      
Entity Information [Line Items]      
Notes Receivable $ 410.0 $ 410.0  
Principal [Member] | Non Recourse Notes Payable 2018 [Member]      
Entity Information [Line Items]      
Notes payable $ 368.7 $ 368.7