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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