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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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- Definition

Represents the impact of special tax concession on diluted earnings per share.

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Represents the decrease in foreign taxes due to special tax concession.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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