Stockholders' Equity - Narrative (Details) - USD ($)	6 Months Ended		17 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Feb. 10, 2020	Feb. 07, 2019
Class Of Stock [Line Items]
Stock repurchased program, authorized amount				$ 300,000,000.0	$ 275,000,000.0
Stock repurchased and retired during period, shares	1,779,000	990,000	1,728,672
Stock repurchased and retired during period, value	$ 176,600,000
Stock repurchase program, remaining authorized repurchase amount	$ 123,400,000		$ 123,400,000	$ 50,000,000.0
Restricted stock units (RSUs) [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number	327,797		327,797
Performance share units (PSUs) [Member]
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number	81,796		81,796