Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]      
Weighted-average shares outstanding (basic) (in shares) 121.5 120.9 120.4
Effect of dilutive securities:      
Stock options and restricted stock units (in shares) 1.3 1.1 1.0
Weighted-average shares outstanding (diluted) (in shares) 122.8 122.0 121.4