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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Income Taxes |  |  |  |
Income tax provision | $ 5.2 | $ 10.2 | $ 15.1 | $ 21.5
Effective income tax rate (as a percent) | 15.50% | 18.10% | 15.40% | 18.20%
Decrease in foreign income taxes due to special income tax concession in Singapore | $ 0.4 | $ 1.9 | $ 2.7 | $ 3.8
Impact of income tax concession on basic earnings per common share (in dollars per share) | $ 0.01 | $ 0.03 | $ 0.04 | $ 0.05
Impact of income tax concession on diluted earnings per common share (in dollars per share) | $ 0.01 | $ 0.03 | $ 0.04 | $ 0.05

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