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Segment Disclosures - Summary of Revenue From Services by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services	$ 1,414.7	$ 1,342.4	$ 1,386.9	$ 1,369.9	$ 1,422.3	$ 1,328.8	$ 1,333.6	$ 1,289.7	$ 5,513.9	$ 5,374.4
Service
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services									5,513.9	5,374.4	$ 5,276.8
Service | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services									3,930.0	3,894.6	3,722.5
Service | International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from services									$ 1,583.9	$ 1,479.8	$ 1,554.3

X

- 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
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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