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Acquisitions Acxiom Acquisition (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 01, 2018
Business Acquisition [Line Items]                          
Business Acquisition, Pro Forma Revenue                       $ 10,230.4  
Finite-Lived Intangible Assets, Gross $ 1,333.9       $ 1,336.9         $ 1,333.9 $ 1,336.9    
Cash and Cash Equivalents, at Carrying Value 2,509.0       1,192.2         2,509.0 1,192.2   $ 13.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                         2,327.9
Loans Payable                 $ 500.0     500.0  
Debt Issuance Face Amount                 2,000.0     2,000.0  
Accounts receivable, net of allowance 4,646.4       5,209.2         4,646.4 5,209.2   112.9
Accounts receivable, billable to clients 1,820.7       1,934.1         1,820.7 1,934.1   8.3
Other current assets 390.7       412.4         390.7 412.4   28.2
Property, Plant and Equipment, Net 690.3       778.1         690.3 778.1   159.7
Deferred Income Taxes and Other Tax Liabilities, Noncurrent                         (0.6)
Goodwill 4,945.5       4,894.4       4,875.9 4,945.5 4,894.4 4,875.9 1,110.8
Intangible Assets, Net (Excluding Goodwill)                         995.0
Other non-current assets 424.4       467.9         424.4 467.9   8.3
Accounts Payable                         (37.1)
Accrued Liabilities                         (46.9)
Contract liabilities (657.8)       (585.6)         (657.8) (585.6)   (23.2)
Other non-current liabilities (655.2)       (714.7)         (655.2) (714.7)   (0.8)
Net revenue 2,284.4 $ 1,954.6 $ 1,853.4 $ 1,972.1 2,433.0 $ 2,061.4 $ 2,125.9 $ 2,004.8   8,064.5 8,625.1 8,031.6  
Net Income (Loss) Attributable to Parent                   351.1 656.0 618.9  
Business Acquisition, Pro Forma Net Income (Loss)                       642.2  
Selling General and Administrative Expense (Acquiree)                       35.0  
Interest Expense (Acquiree)                       3.7  
Interest Income (Acquiree)                       0.4  
Other Nonoperating Income Expense (Acquiree)                       10.3  
Goodwill and intangible assets related to acquisitions 28.0       7.6       2,131.0 28.0 7.6 $ 2,131.0  
Customer Lists [Member]                          
Business Acquisition [Line Items]                          
Finite-Lived Intangible Assets, Gross 859.5       861.4         859.5 $ 861.4   600.0
Finite-Lived Intangible Asset, Useful Life                     15 years    
know-how technology [Member]                          
Business Acquisition [Line Items]                          
Finite-Lived Intangible Assets, Gross 224.4       226.2         224.4 $ 226.2   235.0
Finite-Lived Intangible Asset, Useful Life                     9 years    
Trade Names [Member]                          
Business Acquisition [Line Items]                          
Finite-Lived Intangible Assets, Gross $ 235.4       $ 235.0         $ 235.4 $ 235.0   995.0
Indefinite-Lived Trade Names                         $ 160.0
Acxiom [Member]                          
Business Acquisition [Line Items]                          
Net revenue                 181.7        
Net Income (Loss) Attributable to Parent                 $ 20.4