XML 22 R34.htm IDEA: XBRL DOCUMENT v2.4.1.9
Segment Reporting (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue $ 3,469.2us-gaap_Revenues $ 3,502.2us-gaap_Revenues
Americas    
Revenue 2,151.0us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember		 2,081.3us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
Long-lived assets and goodwill 6,136.3omc_LongLivedAssetsAndGoodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember		 6,101.2omc_LongLivedAssetsAndGoodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
UNITED STATES    
Revenue 1,958.2us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 1,871.8us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
EMEA    
Revenue 961.4us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember		 1,061.6us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Long-lived assets and goodwill 2,635.6omc_LongLivedAssetsAndGoodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember		 3,009.0omc_LongLivedAssetsAndGoodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Asia Pacific    
Revenue 356.8us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 359.3us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
Long-lived assets and goodwill $ 549.4omc_LongLivedAssetsAndGoodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 $ 608.5omc_LongLivedAssetsAndGoodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember