LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Sep. 14, 2018
Debt Instrument [Line Items]
Total	$ 4,429.3	$ 3,856.9
Less - current portion	95.7	64.1
Long-term portion	4,333.6	3,792.8
Fair Value
Debt Instrument [Line Items]
Total	4,655.4	3,714.0
Less - current portion	95.7	64.1
Long-term portion	4,559.7	3,649.9
Senior Notes
Debt Instrument [Line Items]
Total			$ 2,497.1
Other Debt Obligations
Debt Instrument [Line Items]
Total	32.4	42.2
Other Debt Obligations | Fair Value
Debt Instrument [Line Items]
Total	$ 32.4	42.2
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Effective interest rate (as a percent)	3.40%
Total	$ 231.5	0.0
Unamortized debt issuance cost	0.9	1.9
Revolving Credit Facility | Line of Credit | Fair Value
Debt Instrument [Line Items]
Total	$ 231.5	0.0
U.S. Dollar-Denominated Term Loans | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Effective interest rate (as a percent)	3.10%
Total	$ 684.7	338.1
Unamortized debt issuance cost	1.1	1.2
U.S. Dollar-Denominated Term Loans | Revolving Credit Facility | Line of Credit | Fair Value
Debt Instrument [Line Items]
Total	$ 684.7	338.1
Floating Rate Notes Due 2021 | Senior Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	3.90%
Total	$ 498.0	496.8	500.0
Unamortized debt issuance cost	2.0	3.2
Floating Rate Notes Due 2021 | Senior Notes | Fair Value
Debt Instrument [Line Items]
Total	$ 500.0	497.4
4.375 Percent Senior Notes Due Twenty Thousand and Twenty Three | Senior Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	4.50%
Total	$ 249.1	$ 248.8
Stated interest rate (as a percent)	4.375%	4.375%
Unamortized debt issuance cost	$ 0.9	$ 1.2
4.375 Percent Senior Notes Due Twenty Thousand and Twenty Three | Senior Notes | Fair Value
Debt Instrument [Line Items]
Total	$ 263.9	254.2
4.150 Percent Senior Notes Due Twenty Thousand and Twenty Four | Senior Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	4.60%
Total	$ 744.3	$ 743.0	$ 748.5
Stated interest rate (as a percent)	4.15%	4.15%	4.15%
Unamortized debt issuance cost	$ 5.7	$ 7.0
4.150 Percent Senior Notes Due Twenty Thousand and Twenty Four | Senior Notes | Fair Value
Debt Instrument [Line Items]
Total	$ 805.5	727.4
4.70 Percent Senior Notes Due Twenty Thousand and Twenty Six | Senior Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	5.00%
Total	$ 1,240.8	$ 1,239.7	$ 1,248.6
Stated interest rate (as a percent)	4.70%	4.70%	4.70%
Unamortized debt issuance cost	$ 9.2	$ 10.3
4.70 Percent Senior Notes Due Twenty Thousand and Twenty Six | Senior Notes | Fair Value
Debt Instrument [Line Items]
Total	$ 1,378.3	1,179.6
3.45 Percent Senior Notes Due Two Thousand and Twenty Six | Senior Notes
Debt Instrument [Line Items]
Effective interest rate (as a percent)	3.50%
Total	$ 748.5	$ 748.3
Stated interest rate (as a percent)	3.45%	3.45%
Unamortized debt issuance cost	$ 1.5	$ 1.7
3.45 Percent Senior Notes Due Two Thousand and Twenty Six | Senior Notes | Fair Value
Debt Instrument [Line Items]
Total	$ 759.1	$ 675.1