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Financial Statements for Guarantors of the Senior Notes - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Restricted cash $ 177.3 [1] $ 195.2
Assets 9,477.0 [1] 9,543.2
Combined Non-Guarantor Subsidiaries | Foreign locations    
Condensed Financial Statements, Captions [Line Items]    
Assets 305.4 317.3
Combined Non-Guarantor Subsidiaries | Non-recourse debt    
Condensed Financial Statements, Captions [Line Items]    
Collateral securing debt 3,549.2 3,509.1
Combined Non-Guarantor Subsidiaries | Capital lease obligations    
Condensed Financial Statements, Captions [Line Items]    
Collateral securing debt 66.3 66.2
Combined Non-Guarantor Subsidiaries | Reportable legal entities    
Condensed Financial Statements, Captions [Line Items]    
Restricted cash 134.1 143.0
Assets $ 5,577.0 $ 5,489.3
[1] (unaudited)