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Borrowings - Schedule of Senior Notes (Footnote) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Percentage of senior unsecured notes exchanged for senior secured second lien notes   99.10%
8.375% Senior Secured Notes Due In 2022 [Member]    
Debt Instrument [Line Items]    
Senior notes   $ 346.9
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Senior notes   $ 346.9
Senior Unsecured Notes [Member] | On Or After May 15, 2017 [Member]    
Debt Instrument [Line Items]    
Redemption price 103.313%  
Senior Unsecured Notes [Member] | 2018 and thereafter [Member]    
Debt Instrument [Line Items]    
Redemption price 100.00%  
Senior Unsecured Notes [Member] | 6.625 Senior Notes, Due 2019 [Member]    
Debt Instrument [Line Items]    
Debt instrument stated percentage of interest 6.625%  
Senior Unsecured Notes [Member] | 6.625 Senior Notes, Due 2019 [Member] | On or After May 15, 2016 [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Redemption period, notice 30 days  
Senior Unsecured Notes [Member] | 6.625 Senior Notes, Due 2019 [Member] | On or After May 15, 2016 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Redemption period, notice 60 days  
Senior Unsecured Notes [Member] | 8.375% Senior Secured Notes Due In 2022 [Member]    
Debt Instrument [Line Items]    
Debt instrument stated percentage of interest 8.375%