Segment Reporting - Financial Information by Regional Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Gross Revenue	$ 2,910.4	$ 2,868.0
Intercompany Revenue	(439.8)	(440.5)
Net Revenue	2,470.6	2,427.5
Depreciation, Amortization, Depletion and Accretion	272.0	283.5
Operating Income (Loss)	422.8	404.2
Capital Expenditures	299.3	263.3
Total Assets	21,782.0	21,108.7	$ 21,617.0
Corporate entities
Segment Reporting Information [Line Items]
Gross Revenue	42.0	43.2
Intercompany Revenue	(3.6)	(3.5)
Net Revenue	38.4	39.7
Depreciation, Amortization, Depletion and Accretion	24.8	29.4
Operating Income (Loss)	(89.7)	(83.3)
Capital Expenditures	127.5	90.0
Total Assets	1,716.2	1,556.5
Group 1 | Operating Segments
Segment Reporting Information [Line Items]
Gross Revenue	1,430.9	1,418.5
Intercompany Revenue	(237.7)	(238.8)
Net Revenue	1,193.2	1,179.7
Depreciation, Amortization, Depletion and Accretion	121.5	129.1
Operating Income (Loss)	288.2	277.9
Capital Expenditures	86.9	92.3
Total Assets	11,052.6	10,677.3
Group 2 | Operating Segments
Segment Reporting Information [Line Items]
Gross Revenue	1,437.5	1,406.3
Intercompany Revenue	(198.5)	(198.2)
Net Revenue	1,239.0	1,208.1
Depreciation, Amortization, Depletion and Accretion	125.7	125.0
Operating Income (Loss)	224.3	209.6
Capital Expenditures	84.9	81.0
Total Assets	$ 9,013.2	$ 8,874.9