Commitments and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Environmental remediation
Estimated liability for environmental investigative and remediation costs	$ 135.9	$ 141.5
Pre-tax charges for environmental matters	8.2	3.6	17.8
Net cash expenditures	14.0	13.0	11.8
Vermiculite Related Matters
Environmental remediation
Estimated liability for environmental investigative and remediation costs	60.4	60.8	16.0
Maximum number of operating plants under U.S. Environmental Protection Agency (EPA) reinvestigation	105
Number of facilities that expanded Libby vermiculite	8
Non-Vermiculite Related Matters
Environmental remediation
Estimated liability for environmental investigative and remediation costs	75.5	80.7
Number of sites for potential contamination claims under U.S. Environmental Protection Agency (EPA) investigation	38
Amount agreed to pay in settlement of outstanding claims	$ 44
Number of outstanding claims settled	35
Number of remaining sites for remediation	2