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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts, current $ 10.4 $ 8.8
Stockholders' Equity    
Common shares authorized (in shares) 400,000,000.0 400,000,000.0
Common shares issued (in shares) 261,000,000.0 258,400,000
Treasury shares (in shares) 12,200,000 8,300,000