Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information
Cash paid for interest	$ 1.1	$ 0.7	$ 0.8
Capitalized interest	(0.4)	(0.6)	(0.4)
Income taxes paid, net of refunds	13.9	17.7	$ 16.4
Non-cash decrease and increase in accounts payable and accrued liabilities for capital expenditures	$ (0.1)	$ 1.7