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STOCKHOLDERS' EQUITY - Share Repurchases and Dividends (Details) - USD ($)	3 Months Ended				6 Months Ended		23 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2016	Jul. 12, 2018	Feb. 07, 2018	Sep. 06, 2017	May 30, 2017	Feb. 28, 2017	Feb. 17, 2015
Stockholders' Equity Note [Abstract]
Stock repurchase program, authorized amount								$ 300,000,000	$ 325,000,000	$ 225,000,000	$ 280,000,000	$ 350,000,000	$ 200,000,000
Stock repurchased during period, shares					0
Stock repurchased during period, value							$ 131,000,000
Treasury stock acquired (in shares)						8,000,000.0
Treasury stock acquired, cost method	$ 2,100,000	$ 300,000	$ 117,800,000	$ 209,500,000		$ 325,000,000
Remaining available repurchase amount	$ 200,000,000				$ 200,000,000
Dividends declared (in dollars per share)	$ 0.11	$ 0.11

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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