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Other Required Disclosures - Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Feb. 14, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligations at inception	$ 0	$ 18.5
Adjustment to liability due to acquisitions	5.5
Accretion of discount	0.3
Asset retirement obligations at end of period	24.3	18.5
Less current portion	1.2
Long-term portion	$ 23.1

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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