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Stock-based Payments - Summary of Restricted Stock Units (Details)
shares in Millions
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Co-Investment RSUs  
Number of RSUs  
Unvested as of December 31, 2017 (in shares) | shares 0.7
Granted (in shares) | shares 0.0
Granted through modification (modified) (in shares) | shares 0.0
Vested (in shares) | shares (0.1)
Forfeited (in shares) | shares (0.1)
Unvested as of September 30, 2018 (in shares) | shares 0.5
Weighted Average Fair Value Per Share  
Unvested as of December 31, 2017 (USD per share) | $ / shares $ 11.28
Granted (USD per share) | $ / shares 17.00
Granted through modification (modified) (USD per share) | $ / shares 0.00
Vested (USD per share) | $ / shares 10.32
Forfeited (USD per share) | $ / shares 11.41
Unvested as of September 30, 2018 (USD per share) | $ / shares $ 11.56
Time-Based RSUs  
Number of RSUs  
Unvested as of December 31, 2017 (in shares) | shares 7.0
Granted (in shares) | shares 0.6
Granted through modification (modified) (in shares) | shares 0.5
Vested (in shares) | shares (0.9)
Forfeited (in shares) | shares (0.2)
Unvested as of September 30, 2018 (in shares) | shares 7.0
Weighted Average Fair Value Per Share  
Unvested as of December 31, 2017 (USD per share) | $ / shares $ 13.48
Granted (USD per share) | $ / shares 17.00
Granted through modification (modified) (USD per share) | $ / shares 17.55
Vested (USD per share) | $ / shares 11.77
Forfeited (USD per share) | $ / shares 13.46
Unvested as of September 30, 2018 (USD per share) | $ / shares $ 14.30
Performance-Based RSUs  
Number of RSUs  
Unvested as of December 31, 2017 (in shares) | shares 2.5
Granted (in shares) | shares 0.2
Granted through modification (modified) (in shares) | shares (0.5)
Vested (in shares) | shares 0.0
Forfeited (in shares) | shares 0.0
Unvested as of September 30, 2018 (in shares) | shares 2.2
Weighted Average Fair Value Per Share  
Unvested as of December 31, 2017 (USD per share) | $ / shares $ 1.50
Granted (USD per share) | $ / shares 3.18
Granted through modification (modified) (USD per share) | $ / shares 4.30
Vested (USD per share) | $ / shares 0.00
Forfeited (USD per share) | $ / shares 0.00
Unvested as of September 30, 2018 (USD per share) | $ / shares $ 1.09