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Earnings per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings per share        
Basic EPS - Net income $ 184.5 $ 196.5 $ 341.0 $ 378.5
Basic EPS - (in shares) 191,900,000 191,500,000 191,900,000 191,400,000
Basic earnings per share (in dollars per share) $ 0.96 $ 1.03 $ 1.78 $ 1.98
Effect of dilutive securities - (in shares) 300,000 400,000 300,000 400,000
Effect of dilutive securities - (in dollars per share)   (0.01) (0.01) (0.01)
Diluted EPS - Net income $ 184.5 $ 196.5 $ 341.0 $ 378.5
Diluted EPS - (in shares) 192,200,000 191,900,000 192,200,000 191,800,000
Diluted EPS (in dollars per share) $ 0.96 $ 1.02 $ 1.77 $ 1.97
Securities excluded from computation of diluted EPS (in shares) 59,636 109,948 47,767 109,948