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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Common stock, par value per share (in dollars per share or pounds sterling per share) $ 0.01 $ 0.01
Common shares, shares authorized (in shares) 700,000,000.0 700,000,000.0
Common Stock, Shares, Outstanding 73,100,000 75,200,000
Common shares, shares issued (in shares) 75,400,000 75,200,000
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 150,000,000.0 150,000,000.0
Preferred Stock, Value, Issued 0 0
Treasury Stock, Common, Shares 2,300,000  
Treasury Stock, Common, Value $ 150.0 $ 0.0