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Amounts Related to Postretirement Plans Not Reclassified in Entirely out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Amortization of prior service cost |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Amortization of postretirement plan items | [1] | $ (1.4) | $ (0.7) | $ (2.8) | $ (1.5)
Amortization of actuarial losses |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Amortization of postretirement plan items | [1] | 39.4 | 47.0 | 78.0 | 95.3
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Amortization of postretirement plan items |  | 38.0 | 46.3 | 75.2 | 93.8
Income tax benefit |  | (1.5) | (0.7) | (2.9) | (3.0)
Net of tax |  | $ 36.5 | $ 45.6 | $ 72.3 | $ 90.8
[1] | These items are included in net periodic postretirement cost (see note (c)).

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