v2.4.0.6

Landfill and Environmental Costs (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Activity in asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure
Asset retirement obligation liabilities, beginning of year	$ 1,052.4	$ 1,037.0
Non-cash additions	8.1	8.2
Acquisitions/divestitures and other adjustments	0	(2.5)
Asset retirement obligation adjustments	0.4	4.6
Payments	(26.7)	(11.8)
Accretion expense	19.2	19.7
Asset retirement obligation liabilities, end of period	1,053.4	1,055.2
Less: Current portion	(107.7)	(89.0)
Long-term portion	$ 945.7	$ 966.2

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Additions due to acquisitions and other adjustments related to asset retirement obligations.

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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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