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Stockholders' Equity - Narrative (Details) - USD ($)	5 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Feb. 06, 2018
Class Of Stock [Line Items]
Stock repurchased program, authorized amount				$ 275,000,000
Stock repurchased and retired during period, shares	1,358,480	1,412,000	1,065,000
Stock repurchased and retired during period, value	$ 133,700,000
Stock repurchase program, remaining authorized repurchase amount	$ 141,300,000	$ 141,300,000
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	717,358	717,358
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	85,010	85,010

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