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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segments:      
Total revenue $ 2,257.0 $ 2,359.8  
Net revenue 2,027.7 1,972.1  
Segment EBITA 264.6 97.2  
Amortization of acquired intangibles 21.6 21.3  
Depreciation 47.6 51.5  
Capital expenditures 28.3 44.6  
Total assets 16,349.7   $ 18,042.7
Operating income 243.0 75.9  
Total (expenses) and other income (126.6) (55.9)  
Income before income taxes 116.4 20.0  
IAN      
Segments:      
Total revenue 1,851.4 1,818.8  
Net revenue 1,734.1 1,664.5  
Segment EBITA 254.3 99.0  
Amortization of acquired intangibles 20.5 20.2  
Depreciation 41.4 44.7  
Capital expenditures 21.7 33.7  
Total assets 13,587.8   14,784.5
CMG      
Segments:      
Total revenue 405.6 541.0  
Net revenue 293.6 307.6  
Segment EBITA 40.4 22.3  
Amortization of acquired intangibles 1.1 1.1  
Depreciation 4.3 5.1  
Capital expenditures 0.7 1.6  
Total assets 1,519.7   1,549.2
Corporate and Other      
Segments:      
Segment EBITA (30.1) (24.1)  
Amortization of acquired intangibles 0.0 0.0  
Depreciation 1.9 1.7  
Capital expenditures 5.9 $ 9.3  
Total assets $ 1,242.2   $ 1,709.0