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Business Acquisitions, Disposition of Assets, Asset Impairments and Restructuring Charges (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Purchase price:    
Cash used in acquisitions, net of cash acquired $ 95.3 $ 42.6
Acquired various solid waste businesses [Member]
   
Purchase price:    
Cash used in acquisitions, net of cash acquired 95.3 42.6
Fair value of operations surrendered 0 48.3
Holdbacks 0.2 1.7
Total 95.5 92.6
Allocated as follows:    
Working capital 4.0 7.1
Property and equipment 29.1 44.5
Other liabilities, net (5.8) (7.8)
Value of assets acquired and liabilities assumed 27.3 43.8
Excess purchase price to be allocated 68.2 48.8
Excess purchase price to be allocated as follows:    
Other intangible assets 17.1 33.1
Goodwill 51.1 15.7
Total allocated $ 68.2 $ 48.8