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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Amount | Publicly traded debt |  |
Liabilities: |  |
Long-term debt | $ 8,265.2 | $ 8,265.2
Carrying Amount | Non-publicly traded debt |  |
Liabilities: |  |
Long-term debt | 25.7 | 26.8
Fair Value | Publicly traded debt |  |
Liabilities: |  |
Long-term debt | 8,912.0 | 9,707.0
Fair Value | Non-publicly traded debt |  |
Liabilities: |  |
Long-term debt | 25.2 | 26.5
Fair Value Measurements on a Recurring Basis | Fair Value |  |
Assets: |  |
Total assets, fair value | 159.3 | 230.7
Liabilities: |  |
Deferred compensation plan liabilities | 95.0 | 92.2
Net investment hedge liability | 55.2 | 85.8
Total liabilities, fair value | 150.2 | 178.0
Fair Value Measurements on a Recurring Basis | Fair Value | Deferred compensation plan assets |  |
Assets: |  |
Plan assets | 72.2 | 69.2
Fair Value Measurements on a Recurring Basis | Fair Value | Qualified Replacement Plan assets |  |
Assets: |  |
Plan assets | 87.1 | 161.5
Fair Value Measurements on a Recurring Basis | Level 1 |  |
Assets: |  |
Total assets, fair value | 126.5 | 199.4
Liabilities: |  |
Deferred compensation plan liabilities | 95.0 | 92.2
Total liabilities, fair value | 95.0 | 92.2
Fair Value Measurements on a Recurring Basis | Level 1 | Deferred compensation plan assets |  |
Assets: |  |
Plan assets | 39.4 | 37.9
Fair Value Measurements on a Recurring Basis | Level 1 | Qualified Replacement Plan assets |  |
Assets: |  |
Plan assets | 87.1 | 161.5
Liabilities: |  |
Cost basis of investment funds | 84.2 | 159.6
Fair Value Measurements on a Recurring Basis | Level 2 |  |
Assets: |  |
Total assets, fair value | 32.8 | 31.3
Liabilities: |  |
Net investment hedge liability | 55.2 | 85.8
Total liabilities, fair value | 55.2 | 85.8
Fair Value Measurements on a Recurring Basis | Level 2 | Deferred compensation plan assets |  |
Assets: |  |
Plan assets | 32.8 | 31.3
Fair Value Measurements on a Recurring Basis | Level 3 |  |
Assets: |  |
Total assets, fair value | 0.0 | 0.0
Liabilities: |  |
Total liabilities, fair value | 0.0 | 0.0
Fair Value Measurements on a Recurring Basis | Level 1 and 2 | Deferred compensation plan assets |  |
Liabilities: |  |
Cost basis of investment funds | $ 59.4 | $ 58.1

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