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Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Summarized financial information concerning reportable segments
Summarized financial information concerning our reportable segments for the three and six months ended June 30, 2019 and 2018 follows:

Gross RevenueIntercompany RevenueNet RevenueDepreciation, Amortization, Depletion and AccretionOperating Income (Loss)Capital ExpendituresTotal Assets
Three Months Ended June 30, 2019
Group 1$1,528.6 $(264.2)$1,264.4 $127.0 $309.0 $137.1 $11,223.2 
Group 21,529.2 (226.9)1,302.3 132.7 228.4 122.2 9,082.5 
Corporate entities43.2 (4.6)38.6 25.0 (100.0)30.1 1,691.1 
Total$3,101.0 $(495.7)$2,605.3 $284.7 $437.4 $289.4 $21,996.8 
Three Months Ended June 30, 2018
Group 1$1,446.4 $(253.1)$1,193.3 $117.8 $275.2 $153.0 $10,851.5 
Group 21,509.2 (224.0)1,285.2 128.4 225.3 101.5 8,914.1 
Corporate entities43.3 (4.0)39.3 29.5 (92.3)24.3 1,438.1 
Total$2,998.9 $(481.1)$2,517.8 $275.7 $408.2 $278.8 $21,203.7 
Gross
Revenue		Intercompany
Revenue		Net
Revenue		Depreciation,
Amortization,
Depletion and
Accretion		Operating
Income
(Loss)		Capital
Expenditures		Total Assets
Six Months Ended June 30, 2019
Group 1$2,959.6 $(502.0)$2,457.6 $248.5 $597.1 $235.6 $11,223.2 
Group 22,966.7 (425.4)2,541.3 258.4 452.7 215.7 9,082.5 
Corporate entities85.2 (8.2)77.0 49.8 (189.6)137.4 1,691.1 
Total$6,011.5 $(935.6)$5,075.9 $556.7 $860.2 $588.7 $21,996.8 
Six Months Ended June 30, 2018
Group 1$2,866.6 $(493.5)$2,373.1 $246.9 $553.1 $183.5 $10,851.5 
Group 22,915.6 (422.3)2,493.3 253.3 434.9 249.7 8,914.1 
Corporate entities86.5 (7.7)78.8 59.0 (175.6)108.9 1,438.1 
Total$5,868.7 $(923.5)$4,945.2 $559.2 $812.4 $542.1 $21,203.7