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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Statement of Comprehensive Income [Abstract]        
Changes in unrealized holding gains and losses on available-for-sale securities. tax $ 0.0 $ 0.1 $ 0.2 $ 0.1
Changes in pension plans, tax 0.0 0.0 0.6 0.0
Changes in value of hedged interest rate caps, tax $ (0.1) $ 0.2 $ (5.3) $ 0.5