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Accounting for Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Accounting for Asset Retirement Obligations [Abstract]
Asset retirement liability, beginning balance	$ 14.7
Accretion expense	0.5
Payments	(0.2)
Foreign currency translation	0
Asset retirement liability, ending balance	15.0
Asset retirement obligation current portion	0.4
Asset retirement obligation noncurrent portion	$ 14.6

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.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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