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Postretirement Benefit Plans - Net Loss and Prior Service Cost that will be Amortized from Accumulated Other Comprehensive Income Loss (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Net actuarial loss | $ 12.3
Prior service cost (credit) | (5.6)
Total | 6.7
Pension [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Net actuarial loss | 7.4
Prior service cost (credit) | 0.9
Total | 8.3
Other Postretirement Benefit Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Net actuarial loss | 4.9
Prior service cost (credit) | (6.5)
Total | $ (1.6)

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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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