LONG-TERM DEBT - Notes (Details) - USD ($)	Sep. 14, 2018	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total		$ 4,429,300,000	$ 3,856,900,000
Senior Notes
Debt Instrument [Line Items]
Par Value	$ 2,500,000,000.0
Discount at Issuance	2,900,000
Total	2,497,100,000
Issuance Cost	21,500,000
Net Proceeds	2,475,600,000
Senior Notes | Floating Rate Notes Due 2021
Debt Instrument [Line Items]
Par Value	500,000,000.0
Discount at Issuance	0
Total	500,000,000.0	498,000,000.0	496,800,000
Issuance Cost	3,500,000
Net Proceeds	496,500,000
Senior Notes | 4.150 Percent Senior Notes Due Twenty Thousand and Twenty Four
Debt Instrument [Line Items]
Par Value	750,000,000.0
Discount at Issuance	1,500,000
Total	748,500,000	744,300,000	743,000,000.0
Issuance Cost	7,400,000
Net Proceeds	741,100,000
Senior Notes | 4.70 Percent Senior Notes Due Twenty Thousand and Twenty Six
Debt Instrument [Line Items]
Par Value	1,250,000,000.0
Discount at Issuance	1,400,000
Total	1,248,600,000	$ 1,240,800,000	$ 1,239,700,000
Issuance Cost	10,600,000
Net Proceeds	$ 1,238,000,000.0