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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Jan. 19, 2018
Line of Credit Facility [Line Items]
Interest expense	$ 15.7	$ 15.7	$ 47.1	$ 53.4
2025 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate	4.375%		4.375%
Senior Notes | 2028 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate	4.625%		4.625%		4.625%
Interest expense	$ 4.8	4.8	$ 14.4	8.5
Senior Notes | 2025 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate	4.375%		4.375%
Interest expense	$ 10.9	10.9	$ 32.7	23.8
Senior Notes | 2022 Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate	5.25%		5.25%
Interest expense	$ 0.0	$ 0.0	$ 0.0	$ 21.1

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Aggregate amount of interest expense on all borrowings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.7,8)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

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+ References

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