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BENEFIT PLANS - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) plan trust shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of executive defined benefit pension plans | plan | 3 |  |
Number of executive retirement programs | plan | 3 |  |
Accumulated benefit obligation | $ 765.9 | $ 712.4 |
Recognized actuarial loss (gain ) - mark to market | $ (32.2) | 4.8 |
Hedge funds, minimum number of days notice prior to redemption | 30 days |  |
Hedge funds, maximum number of days notice prior to redemption | 90 days |  |
Maximum portfolio invested in securities (as a percent) | 5.00% |  |
Maximum equity portfolio's market value invested in securities (as a percent) | 10.00% |  |
Cost recognized | $ 31.8 | 26.9 | $ 30.7
Accrued incentive compensations | $ 149.0 | $ 77.7 |
Number of employee benefit trusts for the purpose of satisfying obligations under Supplemental Retirement Plans | trust | 2 |  |
Number of supplemental retirement plans | plan | 2 |  |
Stock held by employee benefit trusts (in shares) | shares | 600,000 | 600,000 |
Amount held in employee benefit trusts | $ 5.9 | $ 5.9 |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discretionary match of participants' contributions, dependent on certain eligibility rules | 500.00% |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discretionary match of participants' contributions, dependent on certain eligibility rules | 600.00% |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 6.7 | 6.0 |
Recognized actuarial loss (gain ) - mark to market | $ (30.4) | (0.2) | (7.7)
Pension Benefits | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan percentage of employees covered | 10.00% |  |
Employer contributions | $ 0.0 | 0.0 |
Pension Benefits | Non-U.S. Defined Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions |  | 0.2 |
Other Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | 1.5 | 1.6 |
Plan assets in excess of projected benefit obligation and accumulated benefit obligation, plan assets | 585.3 | 554.0 |
Plan assets in excess of projected benefit obligation and accumulated benefit obligation, projected benefit obligation | 588.4 | 552.9 |
Plan assets in excess of projected benefit obligation and accumulated benefit obligation, accumulated benefit obligation | 588.4 | 552.9 |
Recognized actuarial loss (gain ) - mark to market | (1.8) | 5.0 | (0.4)
Other Postretirement Benefit Plans | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation | 115.6 | 108.4 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation | $ 115.0 | 108.3 |
Initial annual rate increase in the per capita cost of covered healthcare benefits | 6.50% |  |
Ultimate annual rate decrease in the per capita cost of covered healthcare benefits | 5.00% |  |
Approved target allocation (as a percent) | 80.00% |  |
Approved target allocation for return seeking assets (as a percent) | 20.00% |  |
Other Postretirement Benefit Plans | Non-U.S. Defined Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation | $ 62.4 | 58.7 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation |  | 51.2 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets | $ 53.1 | 49.3 |
Initial annual rate increase in the per capita cost of covered healthcare benefits | 5.00% |  |
Cost recognized | $ 13.4 | $ 13.9 | $ 14.1

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