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Share-Based Compensation - Summary of Restricted Stock and Performance Unit Award Activity (Details)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Restricted Stock  
Restricted Stock and Performance Units [Roll Forward]  
Outstanding at January 1, 2021 | shares 669,102
Granted | shares 173,970
Vested | shares (164,483) [1]
Forfeitures | shares (6,692)
Outstanding at September 30, 2021 | shares 671,897
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]  
Weighted Average Grant-Date Fair Value, Outstanding at January 1, 2021 | $ / shares $ 102.55
Weighted Average Grant-Date Fair Value, Granted | $ / shares 134.10
Weighted Average Grant-Date Fair Value, Vested | $ / shares 108.73 [1]
Weighted Average Grant-Date Fair Value, Forfeitures | $ / shares 110.47
Weighted Average Grant-Date Fair Value, Outstanding at September 30, 2021 | $ / shares $ 109.13
Performance Units  
Restricted Stock and Performance Units [Roll Forward]  
Outstanding at January 1, 2021 | shares 357,417
Granted | shares 95,236
Vested | shares (74,894) [1]
Forfeitures | shares (19,667)
Outstanding at September 30, 2021 | shares 358,092
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]  
Weighted Average Grant-Date Fair Value, Outstanding at January 1, 2021 | $ / shares $ 103.63
Weighted Average Grant-Date Fair Value, Granted | $ / shares 140.47
Weighted Average Grant-Date Fair Value, Vested | $ / shares 134.53 [1]
Weighted Average Grant-Date Fair Value, Forfeitures | $ / shares 132.58
Weighted Average Grant-Date Fair Value, Outstanding at September 30, 2021 | $ / shares $ 105.38
[1] Upon vesting of the performance unit awards, PCA issued 81,577 shares, which includes 6,683 shares for dividends accrued during the vesting period.