Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts, current $ 6.9 $ 7.7
Stockholders' Equity    
Common shares authorized (in shares) 400,000,000 400,000,000
Common shares issued (in shares) 258,000,000 289,300,000
Treasury stock (in shares) 500,000 300,000