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Schedule I - Condensed Financial Information of the Registrant - Condensed Balance Sheets (Parenthetical) (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2023
Dec. 31, 2022
CONDENSED BALANCE SHEETS    
Accumulated depreciation $ 438.8 $ 512.8
Preferred stock, par value (USD per share) $ 1.00 $ 1.00
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Common stock, par value (USD per share) $ 0.01 $ 0.01
Common stock, shares authorized 2,000,000,000 2,000,000,000
Common stock, shares issued 350,500,000 373,500,000
Common stock, shares outstanding 350,500,000 373,500,000
Parent Company | Reportable Legal Entities    
CONDENSED BALANCE SHEETS    
Accumulated depreciation $ 68.6 $ 59.5
Preferred stock, par value (USD per share) $ 1.00 $ 1.00
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Common stock, par value (USD per share) $ 0.01 $ 0.01
Common stock, shares authorized 2,000,000,000 2,000,000,000
Common stock, shares issued 350,500,000 373,500,000
Common stock, shares outstanding 350,500,000 373,500,000