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Long-Term Debt - Maturities of Long-term Debt (Details) - Series 2014-1 Class A-2 4.227% Fixed Rate Senior Secured Notes - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018 $ 13.0  
2019 13.0  
2020 13.0  
2021 1,257.8  
2022 0.0  
Senior Notes $ 1,296.8 $ 1,300.0