Borrowings and Credit Arrangements - Interest Expense Credit Agreement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Line of Credit Facility [Line Items]
Interest expense	$ 15.7	$ 20.2	$ 31.4	$ 37.7
Credit Agreement
Line of Credit Facility [Line Items]
Interest expense	$ 16.8	$ 13.8	$ 35.5	$ 26.2
Weighted average interest rate	3.864%	3.08%	3.84%	2.96%
Interest rate at end of period	3.873%	3.38%	3.873%	3.38%