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Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Millions, $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 8.0 | $ 6.2
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, authorized (in shares) | 100.0 | 100.0
Preferred stock, issued (in shares) | 0.0 | 0.0
Preferred stock, outstanding (in shares) | 0.0 | 0.0
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 1,000.0 | 1,000.0
Common stock, shares issued (in shares) | 150.9 | 153.1
Common stock, shares outstanding (in shares) | 150.9 | 153.0
Treasury shares, par value (in dollars per share) | $ 0.01 | $ 0.01
Treasury stock, shares held (in shares) | 0.0 | 0.1

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