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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017
Statement of Comprehensive Income [Abstract] |  |
Changes in unrealized holding gains and losses on available-for-sale securities. tax | $ 0.0 | $ 0.2
Changes in pension plans, tax | 0.0 | 0.6
Changes in value of hedged interest rate caps, tax | $ 0.5 | $ (4.9)

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