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Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | $ (1,244.1) | $ (1,244.1) | $ (1,630.1) | $ (1,326.5) | $ (1,647.4)
Reclassification pursuant to ASU No. 2018-02 |  | 0.0 |  |  |
Other comprehensive income before reclassifications |  |  |  | (34.2) |
Amounts reclassified from accumulated other comprehensive income |  | 38.5 | 46.1 | 115.8 | 119.0
Current period other comprehensive income |  |  |  | (127.1) |
Ending balance |  | (1,203.8) | (1,649.9) | (1,203.8) | (1,649.9)
Total |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (3,765.2) | (3,765.2) | (4,067.4) | (3,815.8) | (4,152.8)
Reclassification pursuant to ASU No. 2018-02 | $ (208.7) | (208.7) |  | (208.7) |
Ending balance |  | (3,942.9) | $ (4,036.3) | (3,942.9) | $ (4,036.3)
Translation Adjustments |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | (817.0) |
Reclassification pursuant to ASU No. 2018-02 |  |  |  | 0.0 |
Other comprehensive income before reclassifications |  |  |  | (35.3) |
Amounts reclassified from accumulated other comprehensive income |  |  |  | 0.0 |
Current period other comprehensive income |  |  |  | (35.3) |
Ending balance |  | (852.3) |  | (852.3) |
Postretirement Plans |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | (2,998.8) |
Reclassification pursuant to ASU No. 2018-02 |  |  |  | (208.7) |
Other comprehensive income before reclassifications |  |  |  | 1.1 |
Amounts reclassified from accumulated other comprehensive income |  |  |  | 115.8 |
Current period other comprehensive income |  |  |  | (91.8) |
Ending balance |  | $ (3,090.6) |  | $ (3,090.6) |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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