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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash provided by operating activities:      
Net income $ 588.9 $ 507.5 $ 496.5
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization of property and equipment 511.4 511.6 520.6
Landfill depletion and amortization 255.5 250.6 278.5
Amortization of intangible and other assets 76.7 71.5 70.6
Accretion 78.0 80.5 88.8
Non-cash interest expense - debt 25.6 52.4 92.1
Non-cash interest expense - other 49.8 48.1 58.1
Restructuring related charges   (2.0) 34.0
Stock-based compensation 20.6 24.5 15.0
Deferred tax provision (benefit) 334.8 61.3 (24.6)
Provision for doubtful accounts, net of adjustments 21.0 23.6 27.3
Excess income tax benefit from stock option exercises (2.5) (3.5) (2.5)
Asset impairments 49.1 15.1 7.1
Loss on extinguishment of debt 210.8 160.8 134.1
(loss) on disposition of assets, net (43.0) (11.2) (147.1)
Other non-cash items (6.7) 3.8 (0.1)
Change in assets and liabilities, net of effects from business acquisitions and divestitures:      
Accounts receivable (16.0) 8.8 53.1
Prepaid expenses and other assets (5.1) (76.6) (11.9)
Accounts payable 11.9 (34.9) (6.9)
Restructuring and synergy related expenditures (3.0) (20.0) (66.5)
Capping, closure and post-closure expenditures (105.7) (111.3) (100.9)
Remediation expenditures (45.0) (50.5) (56.2)
Other liabilities (240.4) (76.4) (62.6)
Cash provided by operating activities 1,766.7 1,433.7 1,396.5
Cash used in investing activities:      
Purchases of property and equipment (936.5) (794.7) (826.3)
Proceeds from sales of property and equipment 34.6 37.4 31.8
Cash used in business acquisitions and development projects, net of cash acquired (42.6) (58.9) (0.1)
Cash proceeds from divestitures, net of cash divested 14.2 60.0 511.1
Change in restricted cash and marketable securities (16.8) 66.3 41.6
Other (3.1) (0.6) (0.6)
Cash used in investing activities (950.2) (690.5) (242.5)
Cash used in financing activities:      
Proceeds from notes payable and long-term debt 1,416.4 1,193.5 1,472.6
Proceeds from issuance of senior notes, net of discount 1,844.9 1,499.4 1,245.4
Payments of notes payable and long-term debt (3,224.5) (3,090.3) (3,583.9)
Premiums paid on extinguishment of debt (89.6) (30.4) (47.3)
Fees paid to issue and retire senior notes and certain hedging relationships (58.8) (26.2) (14.3)
Issuances of common stock 40.7 86.5 39.6
Excess income tax benefit from stock option exercises 2.5 3.5 2.5
Purchases of common stock for treasury (460.7) (43.1) (1.0)
Cash dividends paid (309.4) (294.6) (288.3)
Distributions paid to noncontrolling interests   (1.2)  
Cash used in financing activities (838.5) (702.9) (1,174.7)
(Decrease) increase in cash and cash equivalents (22.0) 40.3 (20.7)
Cash and cash equivalents at beginning of period 88.3 48.0 68.7
Cash and cash equivalents at end of period $ 66.3 $ 88.3 $ 48.0