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TREASURY STOCK - Narrative (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 11, 2018	Dec. 10, 2018
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Treasury stock (in shares)	2,900,000		2,900,000
Treasury stock	$ 120,100,000		$ 120,600,000
Treasury stock, average cost per share (in dollars per share)	$ 41.87		$ 41.87
Stock repurchase program, authorized amount (up to)				$ 225,000,000.0	$ 150,000,000.0
Amount available for share repurchase under this latest authorization	$ 225,000,000.0
Stock repurchased during period (in shares)	0	0

X

- Definition

Amount of stock repurchase plan authorized.

+ References

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X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

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- Definition

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.

+ References

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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- Definition

Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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- Definition

Amount allocated to previously issued common shares repurchased by the issuing entity and held in treasury.

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