Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Supplemental disclosure of cash flow information:
Interest paid			$ 5.4	$ 5.6
Income taxes paid	0.4	0.4	0.9	1.4
Supplemental disclosure of non-cash transactions:
Non-cash capital expenditures			$ 1.2	$ 0.3