XML 89 R73.htm IDEA: XBRL DOCUMENT v3.22.0.1
Stock-based Compensation - Unvested Shares Relating To Stock Options (Details) - Unvested Stock Options - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Shares    
Beginning balance (in shares) 1.1 2.0
Granted (in shares) 0.0 0.0
Vested (in shares) (0.8) (0.9)
Forfeited (in shares) 0.0 0.0
Ending balance (in shares) 0.3 1.1
Weighted Average Grant Date Fair Value    
Beginning of period weighted average grant date fair value (dollars per share) $ 16.38 $ 16.50
Granted weighted average grant date fair value (dollars per share) 0 0
Vested weighted average grant date fair value (dollars per share) 15.40 16.67
Forfeited weighted average grant date fair value (dollars per share) 0 0
Ending of period weighted average grant date fair value (dollars per share) $ 15.45 $ 16.38