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Segment Reporting (Tables)
3 Months Ended
Mar. 31, 2020
Segment Reporting [Abstract]  
Summarized financial information concerning reportable segments
Summarized financial information concerning our reportable segments for the three months ended March 31, 2020 and 2019 follows:

Gross RevenueIntercompany RevenueNet RevenueDepreciation, Amortization, Depletion and AccretionOperating Income (Loss)Capital ExpendituresTotal Assets
Three Months Ended March 31, 2020
Group 1$1,507.5  $(252.9) $1,254.6  $128.5  $311.7  $114.0  $11,376.6  
Group 21,467.9  (209.4) 1,258.5  134.5  234.5  82.4  9,369.4  
Corporate entities46.1  (5.3) 40.8  26.5  (113.2) 150.4  2,162.9  
Total$3,021.5  $(467.6) $2,553.9  $289.5  $433.0  $346.8  $22,908.9  
Three Months Ended March 31, 2019
Group 1$1,430.9  $(237.7) $1,193.2  $121.5  $288.3  $86.9  $11,103.6  
Group 21,438.1  (198.4) 1,239.7  126.0  223.3  84.2  8,980.2  
Corporate entities41.3  (3.6) 37.7  24.5  (88.8) 128.2  1,698.2  
Total$2,910.3  $(439.7) $2,470.6  $272.0  $422.8  $299.3  $21,782.0