Stockholders' Equity - Additional Information (Details) - Common Stock - USD ($) shares in Millions	1 Months Ended	6 Months Ended
Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Stockholders' Equity [Line Items]
Stock repurchase program, authorized amount	$ 200,000,000
Stock repurchase program, duration	2 years
Stock purchased and retired		1.7	2.0
Stock purchased and retired, amount		$ 40,000,000.0	$ 50,000,000.0

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Balance Type:	debit
Period Type:	duration