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Temporary Equity - Redeemable Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Redeemable noncontrolling interest $ 185.7us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 202.0us-gaap_RedeemableNoncontrollingInterestEquityFairValue
Redeemable noncontrolling interests, currently exercisable $ 96.7omc_RedeemableNoncontrollingInterestsCurrentlyExercisable