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Revenue (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Geographic Areas [Table Text Block]
 Years ended December 31,
Total revenue:202120202019
United States$6,360.2 $5,751.5 $6,368.7 
International:
United Kingdom880.5 742.9 871.8 
Continental Europe892.8 763.5 842.9 
Asia Pacific970.1 879.5 1,102.3 
Latin America430.3 349.7 431.6 
Other706.8 573.9 604.0 
Total International3,880.5 3,309.5 3,852.6 
Total Consolidated$10,240.7 $9,061.0 $10,221.3 
 
 Years ended December 31,
Net revenue:202120202019
United States$5,763.1 $5,211.4 $5,386.1 
International:
United Kingdom781.5 664.3 727.0 
Continental Europe799.7 683.6 742.4 
Asia Pacific791.4 710.5 858.3 
Latin America396.4 323.4 389.9 
Other575.8 471.3 521.4 
Total International3,344.8 2,853.1 3,239.0 
Total Consolidated$9,107.9 $8,064.5 $8,625.1 
 
IANYears ended December 31,
Total revenue:202120202019
United States$5,147.8 $4,658.5 $4,878.1 
International3,271.6 2,751.6 3,113.9 
Total IAN$8,419.4 $7,410.1 $7,992.0 
Net revenue:
United States$4,912.8 $4,451.7 $4,538.1 
International2,927.0 2,469.7 2,790.7 
Total IAN$7,839.8 $6,921.4 $7,328.8 
 
DXTRAYears ended December 31,
Total revenue:202120202019
United States$1,212.4 $1,093.0 $1,490.6 
International608.9 557.9 738.7 
Total DXTRA$1,821.3 $1,650.9 $2,229.3 
Net revenue:
United States$850.3 $759.7 $848.0 
International417.8 383.4 448.3 
Total DXTRA$1,268.1 $1,143.1 $1,296.3 
Contract with Customer, Asset and Liability [Table Text Block]
Contract Balances
The following table provides information about receivables, contract assets and contract liabilities from contracts with customers.
December 31,
2021		December 31,
2020
Accounts receivable, net of allowance of $68.5 and $98.3, respectively$5,177.7 $4,646.4 
Accounts receivable, billable to clients2,347.2 1,820.7 
Contract assets62.3 51.8 
Contract liabilities (deferred revenue)688.5 657.8