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Stock-Based Compensation - Restricted Share Units (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Performance-based restricted share units      
Shares Granted      
Awarded (in shares) 111,000 0  
Cancelled (in shares) (3,000)    
Outstanding at the end of the year (in shares) 108,000    
Weighted-Average Grant Date Fair Value      
Awarded (in dollars per share) $ 27.00    
Cancelled (in dollars per share) 27.00    
Outstanding at the end of the year (in dollars per share) $ 27.00    
Unrecognized compensation cost $ 0.3    
Service-based restricted share units      
Shares Granted      
Outstanding at the beginning of the year (in shares) 6,501,000 3,507,000 800,000
Awarded (in shares) 1,806,000 4,851,000 2,951,000
Vested (in shares) (2,274,000) (1,211,000) (203,000)
Cancelled (in shares) (575,000) (646,000) (41,000)
Outstanding at the end of the year (in shares) 5,458,000 6,501,000 3,507,000
Weighted-Average Grant Date Fair Value      
Outstanding at the beginning of the year (in dollars per share) $ 13.98 $ 16.44 $ 13.19
Awarded (in dollars per share) 24.94 12.41 17.11
Vested (in dollars per share) 14.73 14.69 13.19
Cancelled (in dollars per share) 14.58 14.18 17.23
Outstanding at the end of the year (in dollars per share) $ 17.23 $ 13.98 $ 16.44
Unrecognized compensation cost $ 76.8    
Expected weighted-average recognition period for unrecognized compensation cost 2 years 9 months 18 days    
Total fair value vested $ 33.5 $ 17.8 $ 2.7