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Revenue (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Geographic Areas [Table Text Block]
 Years ended December 31,
Total revenue:202020192018
United States$5,751.5 $6,368.7 $5,851.0 
International:
United Kingdom742.9 871.8 881.4 
Continental Europe763.5 842.9 840.2 
Asia Pacific879.5 1,102.3 1,170.8 
Latin America349.7 431.6 389.0 
Other573.9 604.0 582.0 
Total International3,309.5 3,852.6 3,863.4 
Total Consolidated$9,061.0 $10,221.3 $9,714.4 
 
 Years ended December 31,
Net revenue:202020192018
United States$5,211.4 $5,386.1 $4,825.0 
International:
United Kingdom664.3 727.0 711.7 
Continental Europe683.6 742.4 737.5 
Asia Pacific710.5 858.3 896.8 
Latin America323.4 389.9 350.1 
Other471.3 521.4 510.5 
Total International2,853.1 3,239.0 3,206.6 
Total Consolidated$8,064.5 $8,625.1 $8,031.6 
 
IANYears ended December 31,
Total revenue:202020192018
United States$4,658.5 $4,878.1 $4,318.2 
International2,751.6 3,113.9 3,109.1 
Total IAN$7,410.1 $7,992.0 $7,427.3 
Net revenue:
United States$4,451.7 $4,538.1 $3,953.8 
International2,469.7 2,790.7 2,767.1 
Total IAN$6,921.4 $7,328.8 $6,720.9 
 
DXTRAYears ended December 31,
Total revenue:202020192018
United States$1,093.0 $1,490.6 $1,532.8 
International557.9 738.7 754.3 
Total DXTRA$1,650.9 $2,229.3 $2,287.1 
Net revenue:
United States$759.7 $848.0 $871.2 
International383.4 448.3 439.5 
Total DXTRA$1,143.1 $1,296.3 $1,310.7 
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,
2020		December 31,
2019
Accounts receivable, net of allowance of $98.3 and $40.2, respectively$4,646.4 $5,209.2 
Accounts receivable, billable to clients1,820.7 1,934.1 
Contract assets51.8 63.0 
Contract liabilities (deferred revenue)657.8 585.6