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Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | $ 14,181.3 | $ 11,384.4 | $ 1,826.4
Total other comprehensive income (loss), net of tax | (87.1) | 281.7 | (211.0)
Ending balance | 5,277.8 | 14,181.3 | 11,384.4
Cumulative Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (318.8) | (607.9) |
Other comprehensive (loss) income before reclassifications | (203.0) | 201.7 |
Amounts reclassified to earnings | 29.2 | 87.4 |
Total other comprehensive income (loss), net of tax | (173.8) | 289.1 |
Ending balance | (492.6) | (318.8) | (607.9)
Pension and Postretirement Costs [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (385.5) | (400.0) |
Other comprehensive (loss) income before reclassifications | 29.1 | 6.6 |
Amounts reclassified to earnings | 12.8 | 7.9 |
Total other comprehensive income (loss), net of tax | 41.9 | 14.5 |
Reclassification to retained earnings | (54.5) |  |
Ending balance | (398.1) | (385.5) | (400.0)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (58.8) | (36.9) |
Other comprehensive (loss) income before reclassifications | 14.6 | (27.8) |
Amounts reclassified to earnings | 30.2 | 5.9 |
Total other comprehensive income (loss), net of tax | 44.8 | (21.9) |
Reclassification to retained earnings | (8.1) |  |
Ending balance | (22.1) | (58.8) | (36.9)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning balance | (763.1) | (1,044.8) | (833.8)
Other comprehensive (loss) income before reclassifications | (159.3) | 180.5 |
Amounts reclassified to earnings | 72.2 | 101.2 |
Total other comprehensive income (loss), net of tax | (87.1) | 281.7 |
Reclassification to retained earnings | (62.6) |  |
Ending balance | $ (912.8) | $ (763.1) | $ (1,044.8)

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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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