Share-Based Awards - Summary Of Stock Option Transactions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Options granted during period (in shares)	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning of period (in shares)	1,055,000
Options exercised (in shares)	(168,000)
Options forfeited (in shares)	(71,000)
Options outstanding, end of period (in shares)	816,000	1,055,000
Exercisable, end of period (in shares)	816,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Price, Options outstanding, beginning of period (in dollars per share)	$ 50
Weighted-Average Price, Options exercised (in dollars per share)	21
Weighted-Average Price, Options forfeited (in dollars per share)	54
Weighted-Average Price, Options outstanding, end of period (in dollars per share)	56	$ 50
Weighted-Average Price, Exercisable, end of period (in dollars per share)	$ 56