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STOCKHOLDERS' EQUITY - Share Repurchases and Dividends (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		23 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Feb. 07, 2018	Sep. 06, 2017	May 30, 2017	Feb. 28, 2017	Feb. 17, 2015
Stockholders' Equity Note [Abstract]
Stock repurchase program, authorized amount				$ 325,000,000	$ 225,000,000	$ 280,000,000	$ 350,000,000	$ 200,000,000
Stock Repurchased During Period, Value			$ 131,000,000
Treasury stock acquired (in shares)	5.1
Treasury stock acquired, cost method	$ 209,200,000
Dividends declared (in dollars per share)	$ 0.10	$ 0.08

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.3-04)
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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Subparagraph (SX 210.3-04)
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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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