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Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]      
Capitalized Contract Cost, Amortization $ 874.0 $ 837.4 $ 787.9
Capitalized Contract Cost, Net 2,428.5 2,377.4  
Contract with Customer, Liability 563.4 607.5  
Revenue from Contract with Customer, Excluding Assessed Tax 14,175.2 13,327.7 12,372.0
Contract with Customer, Liability, Revenue Recognized 177.9    
Contract With Customer, Liability, Deferral Net Of Revenue Recognized And Foreign Currency Translation 148.5    
Contract With Customer, Liability, Increase (Decrease) From Foreign Currency Translation (14.7)    
HCM [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 6,441.8 6,204.9 6,020.5
HRO [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 2,444.4 2,261.9 2,068.8
PEO [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 2,712.5 2,463.1 2,173.9
Global [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 2,014.6 1,931.3 1,711.4
client fund interest [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 561.9 466.5 397.4
Employer Services Segment [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 9,942.8 9,454.8 8,914.2
Employer Services Segment [Member] | HCM [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 6,447.5 6,210.2 6,026.7
Employer Services Segment [Member] | HRO [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 924.0 851.3 782.6
Employer Services Segment [Member] | PEO [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0
Employer Services Segment [Member] | Global [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 2,014.6 1,931.3 1,711.4
Employer Services Segment [Member] | client fund interest [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 556.7 462.0 393.5
Professional Employee Organization Services Segment [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 4,242.7 3,882.3 3,468.4
Professional Employee Organization Services Segment [Member] | HCM [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0
Professional Employee Organization Services Segment [Member] | HRO [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 1,525.0 1,414.7 1,290.6
Professional Employee Organization Services Segment [Member] | PEO [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 2,712.5 2,463.1 2,173.9
Professional Employee Organization Services Segment [Member] | Global [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0
Professional Employee Organization Services Segment [Member] | client fund interest [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 5.2 4.5 3.9
Other Segments [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax (10.3) (9.4) (10.6)
Other Segments [Member] | HCM [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax (5.7) (5.3) (6.2)
Other Segments [Member] | HRO [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax (4.6) (4.1) (4.4)
Other Segments [Member] | PEO [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0
Other Segments [Member] | Global [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 0.0 0.0
Other Segments [Member] | client fund interest [Member]      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0.0 $ 0.0 $ 0.0
Deferred costs to obtain a contract [Member]      
Disaggregation of Revenue [Line Items]      
Capitalized Contract Cost, Net 992.3    
Deferred costs to fulfill a contract [Member]      
Disaggregation of Revenue [Line Items]      
Capitalized Contract Cost, Net $ 1,436.2