Segment Reporting (Summarized Financial Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Gross Revenue									$ 11,891.9	$ 12,071.1	$ 11,355.4
Intercompany Revenue									(1,851.0)	(2,029.6)	(1,967.7)
Net Revenue	$ 2,530.0	$ 2,565.7	$ 2,517.8	$ 2,427.5	$ 2,560.0	$ 2,562.0	$ 2,526.7	$ 2,392.8	10,040.9	10,041.5	9,387.7
Depreciation, Amortization, Depletion and Accretion									1,114.1	1,116.1	1,070.2
Operating Income (Loss)	483.3	$ 440.3	$ 408.2	$ 404.2	406.8	$ 448.1	$ 425.5	$ 388.1	1,735.8	1,668.5	1,537.5
Capital Expenditures									1,071.8	989.8	927.8
Total Assets	21,617.0				21,147.0				21,617.0	21,147.0	20,629.6
Operating Segments | Group 1
Segment Reporting Information [Line Items]
Gross Revenue									5,789.9	5,961.3	5,601.3
Intercompany Revenue									(978.0)	(1,085.0)	(1,040.4)
Net Revenue									4,811.9	4,876.3	4,560.9
Depreciation, Amortization, Depletion and Accretion									484.9	477.1	462.3
Operating Income (Loss)									1,156.9	1,135.1	1,059.4
Capital Expenditures									457.0	530.4	416.2
Total Assets	11,011.5				9,934.3				11,011.5	9,934.3	9,747.6
Operating Segments | Group 2
Segment Reporting Information [Line Items]
Gross Revenue									5,928.0	5,844.8	5,551.6
Intercompany Revenue									(857.0)	(928.4)	(913.7)
Net Revenue									5,071.0	4,916.4	4,637.9
Depreciation, Amortization, Depletion and Accretion									493.7	508.8	490.8
Operating Income (Loss)									938.5	945.9	863.0
Capital Expenditures									515.8	362.9	375.1
Total Assets	8,999.6				9,655.4				8,999.6	9,655.4	9,349.7
Corporate entities | Corporate entities
Segment Reporting Information [Line Items]
Gross Revenue									174.0	265.0	202.5
Intercompany Revenue									(16.0)	(16.2)	(13.6)
Net Revenue									158.0	248.8	188.9
Depreciation, Amortization, Depletion and Accretion									135.5	130.2	117.1
Operating Income (Loss)									(359.6)	(412.5)	(384.9)
Capital Expenditures									99.0	96.5	136.5
Total Assets	$ 1,605.9				$ 1,557.3				$ 1,605.9	$ 1,557.3	$ 1,532.3