Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Income tax provision	[1]	$ 4.8	$ 9.9
Effective income tax rate (as a percent)		8.30%	15.30%
Income tax benefit due to change in estimate related to uncertain tax position		$ (4.0)
Decrease in foreign income taxes due to special income tax concession		$ 0.6	$ 2.3
Impact of income tax concession on basic earnings per common share (in dollars per share)		$ 0.01	$ 0.03
Impact of income tax concession on diluted earnings per common share (in dollars per share)		$ 0.01	$ 0.03
Without income tax benefit adjustment
Effective income tax rate (as a percent)		15.40%

[1] Amounts may not add due to rounding