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Financial Statements for Guarantors of the Senior Notes - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]    
Restricted cash $ 176.3 [1] $ 178.2
Assets 9,564.9 [1] 9,125.3
Combined Non-Guarantor Subsidiaries | Foreign locations    
Condensed Financial Statements, Captions [Line Items]    
Assets 330.6 349.4
Combined Non-Guarantor Subsidiaries | Non-recourse debt    
Condensed Financial Statements, Captions [Line Items]    
Collateral securing debt 3,576.7 3,300.9
Combined Non-Guarantor Subsidiaries | Capital lease obligations, net of unamortized debt issuances costs of $0.1 and $0.1    
Condensed Financial Statements, Captions [Line Items]    
Collateral securing debt 66.8 68.0
Combined Non-Guarantor Subsidiaries | Reportable legal entities    
Condensed Financial Statements, Captions [Line Items]    
Restricted cash 120.4 147.1
Assets $ 5,637.5 $ 5,255.9
[1] (unaudited)