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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated OCI (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Gains on cash flow hedges: |  |  |  |
Interest expense | $ 12.0 | $ 13.0 | $ 25.6 | $ 25.7
Income tax expense | 55.8 | 67.3 | 113.4 | 129.9
Net earnings attributable to Snap-on Incorporated | 178.7 | 153.2 | 341.7 | 294.8
Amortization of net unrecognized losses and prior service credits |  |  |  |
Total reclassifications for the period, net of tax | (5.7) | (4.0) | (11.0) | (7.9)
Cash Flow Hedges |  |  |  |
Amortization of net unrecognized losses and prior service credits |  |  |  |
Total reclassifications for the period, net of tax | 0.3 | 0.4 | 0.8 | 0.7
Amortization of net unrecognized losses and prior service credits |  |  |  |
Amortization of net unrecognized losses and prior service credits |  |  |  |
Amortization of net unrecognized losses and prior service credits | (8.0) | (6.7) | (15.6) | (13.2)
Defined Benefit Pension and Postretirement Plans |  |  |  |
Amortization of net unrecognized losses and prior service credits |  |  |  |
Income tax benefit | 2.0 | 2.3 | 3.8 | 4.6
Total reclassifications for the period, net of tax | (6.0) | (4.4) | (11.8) | (8.6)
Reclassification out of AOCI | Cash Flow Hedges |  |  |  |
Gains on cash flow hedges: |  |  |  |
Income tax expense | 0.0 | 0.0 | 0.0 | 0.0
Net earnings attributable to Snap-on Incorporated | 0.3 | 0.4 | 0.8 | 0.7
Reclassification out of AOCI | Treasury locks | Cash Flow Hedges |  |  |  |
Gains on cash flow hedges: |  |  |  |
Interest expense | $ 0.3 | $ 0.4 | $ 0.8 | $ 0.7

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