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Stockholders' Equity - Narrative (Details) - USD ($)	11 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 07, 2019	Feb. 06, 2018
Class Of Stock [Line Items]
Stock repurchased and retired during period, shares	2,036,188	2,118,000	2,012,000	3,240,000
Stock repurchased and retired during period, value	$ 210,100,000
Stock repurchase program, remaining authorized repurchase amount	$ 65,000,000.0	$ 65,000,000.0
New Repurchase [Member]
Class Of Stock [Line Items]
Stock repurchased program, authorized amount						$ 275,000,000.0
New Repurchase [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Stock repurchased program, authorized amount					$ 275,000,000.0
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	576,992	576,992
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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