v2.4.0.6
Segment Reporting (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Summarized financial information concerning our reportable segments      
Gross Revenue $ 2,397.8 $ 2,366.6  
Intercompany Revenue (399.2) (384.2)  
Net Revenue 1,998.6 1,982.4  
Depreciation, Amortization, Depletion and Accretion 228.8 233.4  
Operating Income (Loss) 274.2 326.9  
Capital Expenditures 214.8 274.2  
Total Assets 19,639.1 19,455.9 19,616.9
East [Member]
     
Summarized financial information concerning our reportable segments      
Gross Revenue 693.8 699.1  
Intercompany Revenue (95.5) (94.8)  
Net Revenue 598.3 604.3  
Depreciation, Amortization, Depletion and Accretion 61.4 59.9  
Operating Income (Loss) 115.5 120.7  
Capital Expenditures 32.2 67.2  
Total Assets 4,891.7 4,910.6  
Central [Member]
     
Summarized financial information concerning our reportable segments      
Gross Revenue 711.2 712.6  
Intercompany Revenue (128.7) (127.3)  
Net Revenue 582.5 585.3  
Depreciation, Amortization, Depletion and Accretion 72.5 72.2  
Operating Income (Loss) 112.5 106.5  
Capital Expenditures 44.0 44.6  
Total Assets 5,650.2 5,558.9  
West [Member]
     
Summarized financial information concerning our reportable segments      
Gross Revenue 967.4 926.3  
Intercompany Revenue (171.8) (158.7)  
Net Revenue 795.6 767.6  
Depreciation, Amortization, Depletion and Accretion 82.8 82.0  
Operating Income (Loss) 171.3 163.4  
Capital Expenditures 54.6 93.1  
Total Assets 8,206.9 8,188.4  
Corporate entities [Member]
     
Summarized financial information concerning our reportable segments      
Gross Revenue 25.4 28.6  
Intercompany Revenue (3.2) (3.4)  
Net Revenue 22.2 25.2  
Depreciation, Amortization, Depletion and Accretion 12.1 19.3  
Operating Income (Loss) (125.1) (63.7)  
Capital Expenditures 84.0 69.3  
Total Assets $ 890.3 $ 798.0