Environmental and Legal Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Oct. 17, 2012
Hamilton Plant [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	$ 0.7
Mansfield OH Works [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	1.1
Proposed civil penalty related to environmental issue		0.3
Ashland coke plant [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	0.5
Ambridge Works [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	2.2
Middletown Works RCRA Site [Member]
Site Contingency [Line Items]
Site contingency accrual, undiscounted amount	$ 13.8