Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Supplemental disclosure of cash flow information:
Interest paid			$ 12.1	$ 14.0
Income taxes paid	0.4	0.6	1.1	1.3
Supplemental disclosure of non-cash transactions:
Stock repurchases not yet settled (accrued in accounts payable)			0.3	0.6
Non-cash capital expenditures			1.1	4.4
Capital leases acquired			$ 0	$ 0.2