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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Summarized financial information concerning our reportable segments Summarized financial information concerning our reportable segments for the years ended December 31, 2018, 2017 and 2016 follows:
 
Gross
Revenue
 
Intercompany
Revenue
 
Net
Revenue
 
Depreciation,
Amortization,
Depletion and
Accretion
 
Operating
Income
(Loss)
 
Capital
Expenditures
 
Total Assets
2018:
 
 
 
 
 
 
 
 
 
 
 
 
 
Group 1
$
5,789.9

 
$
(978.0
)
 
$
4,811.9

 
$
484.9

 
$
1,156.9

 
$
457.0

 
$
11,011.5

Group 2
5,928.0

 
(857.0
)
 
5,071.0

 
493.7

 
938.5

 
515.8

 
8,999.6

Corporate entities
174.0

 
(16.0
)
 
158.0

 
135.5

 
(359.6
)
 
99.0

 
1,605.9

Total
$
11,891.9

 
$
(1,851.0
)
 
$
10,040.9

 
$
1,114.1

 
$
1,735.8

 
$
1,071.8

 
$
21,617.0

2017:
 
 
 
 
 
 
 
 
 
 
 
 
 
Group 1
$
5,961.3

 
$
(1,085.0
)
 
$
4,876.3

 
$
477.1

 
$
1,135.1

 
$
530.4

 
$
9,934.3

Group 2
5,844.8

 
(928.4
)
 
4,916.4

 
508.8

 
945.9

 
362.9

 
9,655.4

Corporate entities
265.0

 
(16.2
)
 
248.8

 
130.2

 
(412.5
)
 
96.5

 
1,557.3

Total
$
12,071.1

 
$
(2,029.6
)
 
$
10,041.5

 
$
1,116.1

 
$
1,668.5

 
$
989.8

 
$
21,147.0

2016:
 
 
 
 
 
 
 
 
 
 
 
 
 
Group 1
$
5,601.3

 
$
(1,040.4
)
 
$
4,560.9

 
$
462.3

 
$
1,059.4

 
$
416.2

 
$
9,747.6

Group 2
5,551.6

 
(913.7
)
 
4,637.9

 
490.8

 
863.0

 
375.1

 
9,349.7

Corporate entities
202.5

 
(13.6
)
 
188.9

 
117.1

 
(384.9
)
 
136.5

 
1,532.3

Total
$
11,355.4

 
$
(1,967.7
)
 
$
9,387.7

 
$
1,070.2

 
$
1,537.5

 
$
927.8

 
$
20,629.6