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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic and Diluted EPS Numerator:      
Net income $ 529.0 $ 468.2 $ 370.8
Net loss attributable redeemable noncontrolling interest     4.1
Net income excluding redeemable noncontrolling interest 529.0 468.2 374.9
Change in redemption value of redeemable noncontrolling interest     (0.5)
Earnings allocated to participating securities (1.7) (1.2) (1.7)
Net income allocated to common stockholders $ 527.3 $ 467.0 $ 372.7
Basic EPS Denominator:      
Weighted average shares outstanding (in shares) 107.0 109.1 111.4
Basic earnings per share (in dollars per share) $ 4.93 $ 4.28 $ 3.35
Diluted EPS Denominator:      
Weighted average shares outstanding (in shares) 107.0 109.1 111.4
Dilutive common shares issued under stock program (in shares) 0.2 0.2 0.4
Total dilutive weighted average shares (in shares) 107.2 109.3 111.8
Diluted earnings per share (in dollars per share) $ 4.92 $ 4.27 $ 3.34