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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Weighted-average shares outstanding (basic) (in shares) 120.8 120.3 120.8 120.3
Effect of dilutive securities:        
Stock options and restricted stock units (in shares) 1.2 1.1 1.0 1.1
Weighted-average shares outstanding (diluted) (in shares) 122.0 121.4 121.8 121.4