Fair Value Disclosure (Narrative) (Details) (USD $) In Millions, unless otherwise specified				6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013 Reed Minerals	Aug. 31, 2012 Reed Minerals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchase price					$ 70.9
Liability for contingent consideration				1.6	1.6
Decrease in contingent consideration liability				2.4
Long-term debt excluding capital leases	152.9	166.8	161.4
Long-term Debt	$ 152.5	$ 166.0	$ 160.5