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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for credit losses $ 53.8 $ 35.5
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred stock, shares authorized (in shares) 100,000 100,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000.0 100,000,000.0
Common stock, shares issued (in shares) 62,900,000 65,200,000
Common stock, shares outstanding (in shares) 62,900,000 65,200,000