Share-Based Compensation - Summary of Restricted Stock and Performance Units Activity (Details) - $ / shares		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Restricted Stock and Performance Units [Roll Forward]
Outstanding at January 1		743,591	739,732	786,079
Granted		199,499	173,144	173,199
Vested	[1]	(212,809)	(165,547)	(213,992)
Forfeitures		(13,329)	(3,738)	(5,554)
Outstanding at December 31		716,952	743,591	739,732
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]
Weighted Average Grant-Date Fair Value, Outstanding at January 1		$ 86.90	$ 77.23	$ 63.44
Weighted Average Grant-Date Fair Value, Granted		95.48	114.63	107.57
Weighted Average Grant-Date Fair Value, Vested	[1]	68.59	72.84	51.37
Weighted Average Grant-Date Fair Value, Forfeitures		98.86	78.66	69.03
Weighted Average Grant-Date Fair Value, Outstanding at December 31		$ 94.50	$ 86.90	$ 77.23
Performance Units
Restricted Stock and Performance Units [Roll Forward]
Outstanding at January 1		266,704	226,558	232,088
Granted		115,608	83,515	53,070
Vested	[2]	(59,165)	(43,369)	(58,600)
Outstanding at December 31		323,147	266,704	226,558
Restricted Stock and Performance Units (Weighted Average Grant-date Fair Value) [Abstract]
Weighted Average Grant-Date Fair Value, Outstanding at January 1		$ 90.01	$ 77.07	$ 62.68
Weighted Average Grant-Date Fair Value, Granted		96.98	115.35	108.19
Weighted Average Grant-Date Fair Value, Vested	[2]	67.84	71.19	56.08
Weighted Average Grant-Date Fair Value, Outstanding at December 31		$ 96.56	$ 90.01	$ 77.07

[1] The total fair value of awards upon vesting for the years ended December 31, 2019, 2018, and 2017 was $19.9 million, $18.9 million, and $23.3 million, respectively.

[2] The total fair value of awards upon vesting for the years ended December 31, 2019, 2018, and 2017 was $5.5 million, $5.4 million, and $7.5 million, respectively. Upon vesting of the awards in 2019, 2018, and 2017, PCA issued 59,165 shares, 46,876 shares, and 67,391 shares, respectively. For 2019, 2018, and 2017, these amounts included 6,063 shares, 3,507 shares, and 8,791 shares, respectively, for dividends accrued during the vesting period.