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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 |

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