Shareholders' Equity - Shares Outstanding (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock (in shares)	14,592,888		14,592,888
Preferred stock, shares authorized (in shares)	50,000,000		50,000,000
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01
Preferred stock, shares issued (in shares)	0		0
Preferred stock, shares outstanding (in shares)	0		0
Class A
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	175,000,000		175,000,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued at beginning of period (in shares)	75,714,163	71,727,061
Issued pursuant to benefit plans (in shares)	786,575	450,175
Withheld for taxes pursuant to benefit plans (in shares)	(247,508)	(119,644)
Class B common stock converted to Class A common stock (in shares)	17,232,791	0
Shares issued at end of period (in shares)	93,486,021	72,057,592
Treasury stock (in shares)	14,592,888	14,592,888
Total shares outstanding (in shares)	78,893,133	57,464,704
Class B
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	25,000,000		25,000,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued at beginning of period (in shares)	20,308,454	23,793,669
Issued pursuant to benefit plans (in shares)	0	0
Withheld for taxes pursuant to benefit plans (in shares)	0	0
Class B common stock converted to Class A common stock (in shares)	(17,232,791)	0
Shares issued at end of period (in shares)	3,075,663	23,793,669
Treasury stock (in shares)	0	0
Total shares outstanding (in shares)	3,075,663	23,793,669