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Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |
Other income (expense), net | $ 6.3 |  | $ 2.1 |  | $ (8.5) | $ (6.1)
Income tax expense | (28.5) |  | (41.5) |  | (66.5) | (60.0)
Net income | 85.8 | $ 111.2 | 102.7 | $ (4.0) | 197.0 | 98.8
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 | 1.0 |  | 0.7 |  | 2.0 | 1.5
Income tax expense | (0.3) |  | (0.2) |  | (0.5) | (0.4)
Net income | 0.7 |  | 0.5 |  | 1.5 | 1.1
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 | (0.4) |  | (0.4) |  | (0.7) | (0.7)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |
Other income (expense), net | $ 1.4 |  | $ 1.1 |  | $ 2.7 | $ 2.2

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