Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Cash-Settled RSU Awards) (Details)

v3.20.4
Share-Based Compensation (Cash-Settled RSU Awards) (Details)
shares in Thousands
3 Months Ended 12 Months Ended
Aug. 07, 2020
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Weighted Average Grant-Date Fair Value per Share          
Stock split, conversion ratio 0.1        
Cash-settleable RSU awards          
Cash-Settled RSU Awards          
Unvested at the beginning of the period (in shares) | shares     86 66 61
Granted (in shares) | shares     142 44 35
Vested (in shares) | shares     (16) (16) (28)
Did not vest at end of performance period (in shares) | shares   (16)      
Forfeited (in shares) | shares     0 (8) (2)
Unvested at the end of the period (in shares) | shares   196 196 86 66
Weighted Average Grant-Date Fair Value per Share          
Unvested at the beginning of the period, Grant Date Fair Value per Share (usd per share) | $ / shares     $ 124.22 $ 147.59 $ 123.82
Granted, grant date fair value per share (usd per share) | $ / shares     26.84 105.08 164.77
Vested, grant date fair value per share (usd per share) | $ / shares     160.39 155.29 116.67
Did not vest at end of performance period (usd per share) | $ / shares   $ 163.55      
Forfeited, grant date fair value per share (usd per share) | $ / shares     0 145.71 161.50
Unvested at the end of the period, grant date fair value per share (usd per share) | $ / shares   $ 47.56 $ 47.56 $ 124.22 $ 147.59