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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for credit loss, current $ 21.2 $ 29.6
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 100,000,000.0 100,000,000.0
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 1,000,000,000.0 1,000,000,000.0
Common stock, shares outstanding (in shares) 138,300,000 141,900,000