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Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ (1,326.5) |
Other comprehensive income before reclassifications |  |  | (26.7) |
Amounts reclassified from accumulated other comprehensive income | $ 38.6 | $ 38.0 | 77.3 | $ 72.9
Current period other comprehensive income |  |  | 50.6 |
Ending balance | (1,244.1) |  | (1,244.1) |
Total |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | (3,815.8) |
Ending balance | (3,765.2) |  | (3,765.2) |
Translation Adjustments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | (817.0) |
Other comprehensive income before reclassifications |  |  | (27.5) |
Amounts reclassified from accumulated other comprehensive income |  |  | 0.0 |
Current period other comprehensive income |  |  | (27.5) |
Ending balance | (844.5) |  | (844.5) |
Postretirement Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | (2,998.8) |
Other comprehensive income before reclassifications |  |  | 0.8 |
Amounts reclassified from accumulated other comprehensive income |  |  | 77.3 |
Current period other comprehensive income |  |  | 78.1 |
Ending balance | $ (2,920.7) |  | $ (2,920.7) |

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