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Defined Benefit Plans - Reconciliation of Level Three Measurements (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | $ 68.5 | $ 64.5
Actual return on assets related to assets still held | 4.7 | 4.0
Ending balance | 73.2 | 68.5
Group annuity/insurance contracts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | 21.8 | 21.2
Actual return on assets related to assets still held | 0.5 | 0.6
Ending balance | 22.3 | 21.8
Commingled Funds | Multi-strategy hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | 21.6 | 20.5
Actual return on assets related to assets still held | 0.7 | 1.1
Ending balance | 22.3 | 21.6
Commingled Funds | Real estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | 25.1 | 22.8
Actual return on assets related to assets still held | 3.5 | 2.3
Ending balance | $ 28.6 | $ 25.1

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