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Revenue - Geographical Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 865.8	$ 852.4	$ 818.4	$ 830.7	$ 813.5	$ 824.0	$ 789.3	$ 791.1	$ 3,367.3	$ 3,217.9	$ 3,058.8
United States
Disaggregation of Revenue [Line Items]
Revenues									2,536.0	2,417.6	2,374.8
Europe
Disaggregation of Revenue [Line Items]
Revenues									396.0	377.5	305.1
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues									286.0	275.6	247.2
Rest of World
Disaggregation of Revenue [Line Items]
Revenues									$ 149.3	$ 147.2	$ 131.7

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+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Publisher FASB
-Name Accounting Standards Codification
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