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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Shares Repurchased and Retired During Year
During 2017, 2016, and 2015, pursuant to a stock repurchase program authorized by the Company’s Board of Directors, the Company repurchased and retired the following amounts and number of shares:

(In millions, except share amounts)
 
2017
 
2016
 
2015
Repurchases
 
$
—

 
$
3.8

 
$
46.3

Shares
 
—

 
144,600

 
1,568,731