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Debt - 6.00% Senior Convertible Notes due 2020 (Details) - USD ($)
$ in Millions
Jun. 23, 2015
Jun. 17, 2015
TPG Aviator, L.P.    
Debt    
Ownership percentage (percent)   43.80%
Senior Notes | 6.00% Senior Convertible Notes Due 2020    
Debt    
Stated interest rate (percent) 6.00%  
Aggregate principal amount $ 80.0  
Senior Notes | 6.00% Senior Convertible Notes Due 2020 | TPG Aviator, L.P.    
Debt    
Aggregate principal amount   $ 20.0
Proceeds from notes   $ 20.0
Senior Notes | 7.50% Exchange Notes and 7.50% Notes    
Debt    
Cash paid for interest $ 1.5