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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated OCI (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of net unrecognized losses and prior service credits | $ (6.6) | $ (7.6) | $ (19.8) | $ (22.7)
Interest expense | 13.1 | 13.1 | 38.8 | 39.1
Income tax expense | 57.2 | 59.6 | 187.1 | 179.4
Amounts reclassified from Accumulated OCI, Net of tax | (3.8) | (4.7) | (11.7) | (14.1)
Reclassification out of AOCI [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated OCI, Net of tax | (3.8) | (4.7) | (11.7) | (14.1)
Cash Flow Hedges [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated OCI, Net of tax | 0.5 | 0.1 | 1.2 | 0.3
Cash Flow Hedges [Member] | Reclassification out of AOCI [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated OCI, Net of tax | 0.5 | 0.1 | 1.2 | 0.3
Defined Benefit Pension and Postretirement Plans [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amounts reclassified from Accumulated OCI, Net of tax | (4.3) | (4.8) | (12.9) | (14.4)
Defined Benefit Pension and Postretirement Plans [Member] | Reclassification out of AOCI [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of net unrecognized losses and prior service credits | (6.6) | (7.6) | (19.8) | (22.7)
Income tax expense | 2.3 | 2.8 | 6.9 | 8.3
Amounts reclassified from Accumulated OCI, Net of tax | (4.3) | (4.8) | (12.9) | (14.4)
Treasury Locks [Member] | Cash Flow Hedges [Member] | Reclassification out of AOCI [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | $ 0.5 | $ 0.1 | $ 1.2 | $ 0.3

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