Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Income tax provision	$ 7.1	[1]	$ 4.6	[2]	$ 10.3	[1]	$ 15.9	[2]
Effective income tax rate (as a percent)	19.40%		13.70%		11.20%		16.90%
Income tax benefit due to change in estimate related to uncertain tax position	$ 2.4				$ 1.6
Decrease in foreign income taxes due to special income tax concession	$ 1.2		$ 0.4		$ 1.8		$ 2.7
Impact of income tax concession on basic earnings per common share (in dollars per share)	$ 0.02		$ 0.01		$ 0.03		$ 0.04
Impact of income tax concession on diluted earnings per common share (in dollars per share)	$ 0.02		$ 0.01		$ 0.03		$ 0.04
Without income tax benefit adjustment
Effective income tax rate (as a percent)	12.80%				13.00%

[1] Amounts may not add due to rounding

[2] Amounts may not add due to rounding