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Segment Disclosures - Segment Revenue Per Service (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Revenue from Services    
Segment Revenue from Services $ 1,320.6us-gaap_SalesRevenueServicesNet $ 1,330.8us-gaap_SalesRevenueServicesNet
Less: Intersegment revenue    
Revenue from Services    
Segment Revenue from Services (17.8)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember		 (14.4)us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Total Americas Commercial and PT | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 874.2us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_Americas1Member		 849.6us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_Americas1Member
Americas Commercial | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 641.4us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_AmericasCommercialMember		 613.2us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_AmericasCommercialMember
Americas PT | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 232.8us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_AmericasPTMember		 236.4us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_AmericasPTMember
Total EMEA Commercial and PT | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 218.6us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_EMEA1Member		 269.6us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_EMEA1Member
EMEA Commercial | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 178.3us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_EMEACommercialMember		 221.9us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_EMEACommercialMember
EMEA PT | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 40.3us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_EMEAPTMember		 47.7us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_EMEAPTMember
Total APAC Commercial and PT | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 96.1us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_APACMember		 91.6us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_APACMember
APAC Commercial | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 85.6us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_APACCommercialMember		 83.0us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_APACCommercialMember
APAC PT | Reporting Segments    
Revenue from Services    
Segment Revenue from Services 10.5us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_APACPTMember		 8.6us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_APACPTMember
OCG | Reporting Segments    
Revenue from Services    
Segment Revenue from Services $ 149.5us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_OCGMember		 $ 134.4us-gaap_SalesRevenueServicesNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kelya_OCGMember