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Stockholders’ Equity - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 5,253.2 | $ 14,181.3 | $ 11,384.4
Other comprehensive income (loss) before reclassifications | (17.7) | (159.3) |
Amounts reclassified to earnings | 10.6 | 72.2 |
Total other comprehensive income (loss), net of tax | (7.1) | (87.1) | 281.7
Reclassification to retained earnings |  | (62.6) |
Ending balance | 4,996.0 | 5,253.2 | 14,181.3
Cumulative Translation Adjustment |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (492.6) | (318.8) |
Other comprehensive income (loss) before reclassifications | 4.4 | (203.0) |
Amounts reclassified to earnings | 9.7 | 29.2 |
Total other comprehensive income (loss), net of tax | 14.1 | (173.8) |
Reclassification to retained earnings |  | 0.0 |
Ending balance | (478.5) | (492.6) | (318.8)
Pension and Postretirement Costs |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (398.1) | (385.5) |
Other comprehensive income (loss) before reclassifications | (8.0) | 29.1 |
Amounts reclassified to earnings | 7.1 | 12.8 |
Total other comprehensive income (loss), net of tax | (0.9) | 41.9 |
Reclassification to retained earnings |  | (54.5) |
Ending balance | (399.0) | (398.1) | (385.5)
Derivative Financial Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (22.1) | (58.8) |
Other comprehensive income (loss) before reclassifications | (14.1) | 14.6 |
Amounts reclassified to earnings | (6.2) | 30.2 |
Total other comprehensive income (loss), net of tax | (20.3) | 44.8 |
Reclassification to retained earnings |  | (8.1) |
Ending balance | (42.4) | (22.1) | (58.8)
AOCL |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (912.8) | (763.1) | (1,044.8)
Ending balance | $ (919.9) | $ (912.8) | $ (763.1)

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- Definition Amount after tax, of reclassification from AOCI to retained earnings related to the Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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