Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Weighted-Average Outstanding Shares used in Calculations of Basic and Diluted EPS (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Weighted-Average Outstanding Shares used in Calculations of Basic and Diluted EPS (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accounting Policies [Abstract]    
Weighted-average shares outstanding (basic) (in shares) 120.0 118.8
Effect of dilutive securities:    
Stock options and restricted stock units (in shares) 1.9 2.0
Weighted-average shares outstanding (diluted) (in shares) 121.9 120.8