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OTHER COMPREHENSIVE LOSS - Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |
Income tax expense | $ (144.9) | $ (120.3) | $ (75.9)
Net income | 414.4 | 326.7 | $ 294.9
Reclassification out of Accumulated Other Comprehensive Income | Amortization of initial net obligation and prior service cost |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |
Other income (expense), net | (1.5) | (1.5) |
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss (gain) |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |
Other income (expense), net | 5.4 | 4.4 |
Reclassification out of Accumulated Other Comprehensive Income | Pension and Post Retirement Benefit Plans |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |
Other income (expense), net | 3.9 | 2.9 |
Income tax expense | (1.0) | (0.8) |
Net income | $ 2.9 | $ 2.1 |

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