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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Taxes |  |  |  |
Income tax provision | $ 11.8 | $ 13.4 | $ 26.8 | $ 35.0
Effective income tax rate (as a percent) | 19.50% | 19.80% | 16.90% | 18.80%
Decrease in foreign income taxes due to special income tax concession in Singapore | $ 1.1 | $ 1.7 | $ 3.9 | $ 5.5
Impact of income tax concession on basic earnings per common share (in dollars per share) | $ 0.02 | $ 0.02 | $ 0.05 | $ 0.08
Impact of income tax concession on diluted earnings per common share (in dollars per share) | $ 0.02 | $ 0.02 | $ 0.05 | $ 0.08

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