Property, Plant and Equipment Asset Retirement Obligations (Details) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
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Property, Plant and Equipment [Abstract] | ||
Asset Retirement Obligation | $ 193.0 | $ 215.0 |
Asset Retirement Obligation, Current | $ 9.0 | $ 9.0 |
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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