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Restructuring - Narrative (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges included in SG&A expenses	$ 0.0	$ 0.0	$ 0.0	$ 2.4	$ 0.0	$ 0.0	$ 3.4	$ 0.0	$ 2.4	$ 3.4	$ 0.0
Restructuring reserve	0.2				$ 0.5				0.2	0.5	$ 0.5
Additional future restructuring charges	$ 0.0								0.0
GTS
Restructuring Cost and Reserve [Line Items]
Restructuring charges included in SG&A expenses										0.4
Severance costs									2.0
Americas Staffing
Restructuring Cost and Reserve [Line Items]
Restructuring charges included in SG&A expenses										$ 1.8
Severance costs									$ 0.4

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- Definition

Amount of expected cost remaining for the specified restructuring cost.

+ References

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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