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Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Earnings Per Share [Abstract] |  |
Net income | $ 37.9 | $ 43.5
Add: Loss from discontinued operations | 0.0 | 0.0
Income from continuing operations | $ 37.9 | $ 43.5
Weighted-average shares outstanding – basic | 41.5 | 42.8
Add: Potential effect of dilutive securities attributable to stock-based payments | 0.6 | 0.7
Weighted-average shares outstanding – diluted | 42.1 | 43.5
Earnings per share – Basic: |  |
Income from continuing operations (in dollars per share) | $ 0.91 | $ 1.02
Loss from discontinued operations (in dollars per share) | 0.00 | 0.00
Net income (in dollars per share) | 0.91 | 1.02
Earnings per share – Diluted: |  |
Income from continuing operations (in dollars per share) | 0.90 | 1.00
Loss from discontinued operations (in dollars per share) | 0.00 | 0.00
Net income (in dollars per share) | $ 0.90 | $ 1.00

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