Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation - PSU awards (Details)

v3.7.0.1
Equity-Based Compensation - PSU awards (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Performance share unit awards  
Number of units  
Total granted and unvested at the beginning of the period (in shares) | shares 785,301
Vested (in shares) | shares (41,666)
Total awarded and unvested at the end of the period (in shares) | shares 743,635
Weighted average grant date fair value  
Total granted and unvested at the beginning of the period (in dollars per share) | $ / shares $ 29.75
Vested (in dollars per share) | $ / shares 27.38
Total awarded and unvested at the end of the period (in dollars per share) | $ / shares $ 29.88
Additional disclosures  
Additional equity compensation to be recognized over the remaining period | $ $ 12.5
Weighted average period for recognizing unrecognized stock-based compensation expense 1 year 10 months 24 days
Price target performance share unit awards  
Number of successive days closing stock price must achieve specific thresholds for PSUs to vest per schedule 10 days
Vesting period 3 years
Price target performance share unit awards | Vesting before first anniversary | Maximum  
Number of PSUs that may vest, as a percent 0.00%
Price target performance share unit awards | Vesting before the second anniversary | Maximum  
Number of PSUs that may vest, as a percent 33.33%
Price target performance share unit awards | Vesting before the third anniversary  
Number of PSUs that may vest, as a percent 66.67%
TSR performance share unit awards  
Vesting period 3 years
TSR performance share unit awards | Maximum  
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent 200.00%
TSR performance share unit awards | Minimum  
Number of PSUs that may be earned as compared to the number of PSUs granted, as a percent 0.00%