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Pension and Other Postemployment Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plans [Abstract]      
Defined contribution plans, contribution expense $ 108.5 $ 105.7 $ 108.4
Defined Benefit Pension Plans [Member]      
Defined Benefit Pension Plans and Postemployment Arrangements [Abstract]      
Defined benefit plans, plan information Two of our U.S. businesses and several of our non-U.S. businesses sponsor noncontributory defined benefit pension plans. These plans provide benefits to employees based on formulas recognizing length of service and earnings. The U.S. plans cover approximately 900 participants, are closed to new participants and do not accrue future benefit credits. The non-U.S. plans, which include plans required by local law, cover approximately 6,700 participants and are not covered by ERISA.    
Components of Net Periodic Benefit Cost [Abstract]      
Service cost $ 7.8 5.3 6.8
Interest cost 7.8 7.6 8.2
Expected return on plan assets (3.7) (4.0) (4.2)
Amortization of prior service cost 4.5 4.3 4.3
Amortization of actuarial losses 5.3 5.7 2.3
Net periodic benefit cost 21.7 18.9 $ 17.4
Amounts Recognized in Accumulated Other Comprehensive Income [Abstract]      
Unrecognized actuarial gains and losses and unrecognized prior service cost 98.0 95.0  
Unrecognized actuarial gains and losses and unrecognized prior service cost, net of tax 60.0 $ 59.0  
Unrecognized actuarial gains and losses expected to be amortized in the next year $ 10.0    
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Cost [Abstract]      
Discount rate 3.70% 3.50% 4.50%
Compensation increases 2.00% 1.90% 1.80%
Expected return on plan assets 4.80% 5.70% 5.80%
Defined benefit pension plans, contributions by employer $ 6.6 $ 4.2 $ 3.2
Benefit Obligation [Rollforward]      
January 1 234.8 222.7  
Service cost 7.8 5.3 6.8
Interest cost 7.8 7.6 8.2
Amendments, curtailments and settlements 0.0 3.8  
Actuarial losses 13.3 5.9  
Benefits paid (9.4) (7.2)  
Foreign currency translation (3.2) (3.3)  
December 31 251.1 234.8 222.7
Fair Value of Plan Assets [Rollforward]      
January 1 68.9 74.4  
Actual return on plan assets 4.9 (0.5)  
Employer contributions 6.6 4.2 3.2
Benefits paid (9.4) (7.2)  
Foreign currency translation and other (2.4) (2.0)  
December 31 68.6 68.9 74.4
Funded Status [Abstract]      
Funded Status December 31 (182.5) (165.9)  
Amounts Recorded in Balance Sheet [Abstract]      
Other assets 4.2 5.4  
Other current liabilities (5.1) (4.6)  
Long-term liabilities (181.6) (166.7)  
Total amount recognized in balance sheet (182.5) (165.9)  
Accumulated benefit obligation 240.8 226.0  
Plans with Benefit Obligations in Excess of Plan Assets [Abstract]      
Benefit obligation 241.3 215.9  
Plan assets 54.6 44.6  
Plans with benefit obligations in excess of plan assets, Liabilities $ 186.7 $ 171.3  
Weighted Average Assumptions Used to Determine Benefit Obligation [Abstract]      
Discount rate 3.50% 3.80%  
Compensation increases 2.00% 2.00%  
Estimated Future Benefit Payments [Abstract]      
2017 $ 9.0    
2018 8.8    
2019 9.7    
2020 12.6    
2021 15.2    
2022 - 2026 $ 87.7    
Weighted Average Asset Allocations [Abstract]      
Percentage of Plan Assets, Target Allocation 100.00%    
Percentage of Plan Assets, Actual Allocation 100.00% 100.00%  
Defined Benefit Pension Plans [Member] | Level 1      
Fair Value of Plan Assets [Rollforward]      
January 1 $ 64.4    
December 31 64.1 $ 64.4  
Defined Benefit Pension Plans [Member] | Level 2      
Fair Value of Plan Assets [Rollforward]      
January 1 0.3    
December 31 0.2 0.3  
Defined Benefit Pension Plans [Member] | Level 3      
Fair Value of Plan Assets [Rollforward]      
January 1 4.2 3.7  
Actual return on plan assets 0.2 0.1  
Purchases, sales and settlements, net (0.1) 0.4  
December 31 4.3 4.2 3.7
Defined Benefit Pension Plans [Member] | Cash      
Fair Value of Plan Assets [Rollforward]      
January 1 1.8    
December 31 $ 1.6 $ 1.8  
Weighted Average Asset Allocations [Abstract]      
Percentage of Plan Assets, Target Allocation 4.00%    
Percentage of Plan Assets, Actual Allocation 3.00% 3.00%  
Defined Benefit Pension Plans [Member] | Cash | Level 1      
Fair Value of Plan Assets [Rollforward]      
January 1 $ 1.8    
December 31 1.6 $ 1.8  
Defined Benefit Pension Plans [Member] | Mutual funds      
Fair Value of Plan Assets [Rollforward]      
January 1 39.7    
December 31 $ 39.0 $ 39.7  
Weighted Average Asset Allocations [Abstract]      
Percentage of Plan Assets, Target Allocation 54.00%    
Percentage of Plan Assets, Actual Allocation 57.00% 58.00%  
Defined Benefit Pension Plans [Member] | Mutual funds | Level 1      
Fair Value of Plan Assets [Rollforward]      
January 1 $ 39.7    
December 31 39.0 $ 39.7  
Defined Benefit Pension Plans [Member] | Unit trusts      
Fair Value of Plan Assets [Rollforward]      
January 1 22.9    
December 31 $ 23.5 $ 22.9  
Weighted Average Asset Allocations [Abstract]      
Percentage of Plan Assets, Target Allocation 35.00%    
Percentage of Plan Assets, Actual Allocation 34.00% 33.00%  
Defined Benefit Pension Plans [Member] | Unit trusts | Level 1      
Fair Value of Plan Assets [Rollforward]      
January 1 $ 22.9    
December 31 23.5 $ 22.9  
Defined Benefit Pension Plans [Member] | Insurance contracts      
Fair Value of Plan Assets [Rollforward]      
January 1 4.2    
December 31 $ 4.3 $ 4.2  
Weighted Average Asset Allocations [Abstract]      
Percentage of Plan Assets, Target Allocation 6.00%    
Percentage of Plan Assets, Actual Allocation 6.00% 6.00%  
Defined Benefit Pension Plans [Member] | Insurance contracts | Level 3      
Fair Value of Plan Assets [Rollforward]      
January 1 $ 4.2    
December 31 4.3 $ 4.2  
Defined Benefit Pension Plans [Member] | Other      
Fair Value of Plan Assets [Rollforward]      
January 1 0.3    
December 31 $ 0.2 $ 0.3  
Weighted Average Asset Allocations [Abstract]      
Percentage of Plan Assets, Target Allocation 1.00%    
Percentage of Plan Assets, Actual Allocation 0.00% 0.00%  
Defined Benefit Pension Plans [Member] | Other | Level 2      
Fair Value of Plan Assets [Rollforward]      
January 1 $ 0.3    
December 31 $ 0.2 $ 0.3  
Retention Plan [Member]      
Defined Benefit Pension Plans and Postemployment Arrangements [Abstract]      
Defined benefit plans, plan information We have a Senior Executive Restrictive Covenant and Retention Plan (“Retention Plan”) for certain executive officers of Omnicom selected by the Compensation Committee. The Retention Plan is a non-qualified deferred compensation severance plan that was adopted to secure non-competition, non-solicitation, non-disparagement and ongoing consulting services from such executive officers and to strengthen the retention aspect of executive officer compensation. The Retention Plan provides annual payments upon termination following at least seven years of service with Omnicom or its subsidiaries to the participants or to their beneficiaries. A participant’s annual benefit is payable for 15 consecutive calendar years following termination, but in no event prior to age 55. The annual benefit is equal to the lesser of (i) the participant’s final average pay times an applicable percentage, which is based upon the executive’s years of service as an executive officer, not to exceed 35% or (ii) $1.5 million adjusted for cost-of-living, beginning with the second annual payment, not to exceed 2.5% per year. The Retention Plan is not funded and benefits are paid when due.    
Postemployment Arrangements [Member]      
Defined Benefit Pension Plans and Postemployment Arrangements [Abstract]      
Defined benefit plans, plan information We have executive retirement agreements under which benefits will be paid to participants or to their beneficiaries over periods up to ten years beginning after cessation of full-time employment. Our postemployment arrangements are unfunded and benefits are paid when due.    
Components of Net Periodic Benefit Cost [Abstract]      
Service cost $ 3.9 4.8 3.8
Interest cost 3.5 4.3 4.5
Amortization of prior service cost 3.1 3.2 2.1
Amortization of actuarial losses 1.1 1.6 0.9
Net periodic benefit cost 11.6 13.9 $ 11.3
Amounts Recognized in Accumulated Other Comprehensive Income [Abstract]      
Unrecognized actuarial gains and losses and unrecognized prior service cost 51.0 49.0  
Unrecognized actuarial gains and losses and unrecognized prior service cost, net of tax 30.0 $ 29.0  
Unrecognized actuarial gains and losses expected to be amortized in the next year $ 4.6    
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Cost [Abstract]      
Discount rate 4.10% 3.80% 4.70%
Compensation increases 3.50% 3.50% 3.50%
Benefit Obligation [Rollforward]      
January 1 $ 115.9 $ 122.1  
Service cost 3.9 4.8 $ 3.8
Interest cost 3.5 4.3 4.5
Amendments, curtailments and settlements 5.6 (0.6)  
Actuarial losses 0.6 (6.0)  
Benefits paid (9.2) (8.7)  
December 31 120.3 115.9 $ 122.1
Fair Value of Plan Assets [Rollforward]      
Benefits paid (9.2) (8.7)  
Amounts Recorded in Balance Sheet [Abstract]      
Other current liabilities (8.1) (9.3)  
Long-term liabilities (112.2) (106.6)  
Total amount recognized in balance sheet $ (120.3) $ (115.9)  
Weighted Average Assumptions Used to Determine Benefit Obligation [Abstract]      
Discount rate 3.90% 4.10%  
Compensation increases 3.50% 3.50%  
Estimated Future Benefit Payments [Abstract]      
2017 $ 8.1    
2018 8.2    
2019 6.9    
2020 5.8    
2021 5.5    
2022 - 2026 $ 30.5