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Share-based compensation - PSU activity (Details) - Performance share units ("PSUs") - 2014 Plan
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Number of shares  
Non-vested at beginning of year (in shares) | shares 377,169
Restricted stock granted (in shares) | shares 132,362
Forfeited (in shares) | shares (23,064)
Non-vested at end of year (in shares) | shares 486,467
PSUs awarded but not yet earned | shares 96,389
Total non-vested and discretionary PSUs | shares 582,856
Weighted average grant-date fair value  
Non-vested at beginning of year (in dollars per share) | $ / shares $ 16.73
Granted (in dollars per share) | $ / shares 31.71
Forfeited (in dollars per share) | $ / shares 5.76
Non-vested at end of year (in dollars per share) | $ / shares 17.80
PSUs awarded but not yet earned (in dollars per share) | $ / shares 78.15
Total non-vested and discretionary PSUs (in dollars per share) | $ / shares $ 27.78
Other disclosure  
Total weighted average grant date fair value of RSUs granted during the period (in millions) | $ $ 11.7