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Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |
Other income (expense), net | $ 14.3 |  |  | $ 1.9 |  |  | $ 5.8 | $ (4.1)
Income tax expense | (46.9) |  |  | (22.7) |  |  | (113.4) | (82.6)
Net income | 128.5 | $ 85.8 | $ 111.2 | 90.6 | $ 102.7 | $ (4.0) | 325.5 | 189.5
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 |  |  | 3.0 | 2.2
Income tax expense | (0.3) |  |  | (0.2) |  |  | (0.8) | (0.6)
Net income | 0.7 |  |  | 0.5 |  |  | 2.2 | 1.6
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) |  |  | (1.1) | (1.1)
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 |  |  | $ 4.1 | $ 3.3

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