Commitments and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended					6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Feb. 03, 2014	Dec. 31, 2013	Mar. 31, 2011	Jun. 30, 2014 Vermiculite Related Matters facility	Dec. 31, 2010 Vermiculite Related Matters facility	Dec. 31, 2013 Vermiculite Related Matters	Jun. 30, 2014 Non-Vermiculite Related Matters	Dec. 31, 2013 Non-Vermiculite Related Matters
Environmental remediation
Estimated liability for environmental investigative and remediation costs	$ 58.6			$ 135.9	$ 16.0	$ 15.8		$ 60.4	$ 42.8	$ 75.5
Environmental Claim Payments			75.9
Net cash expenditures	$ 7.0	$ 6.3
Maximum number of operating plants under U.S. Environmental Protection Agency (EPA) reinvestigation							105
Number of facilities expanded						8