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Segment Information Operations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segments:        
Revenue $ 1,670.4 $ 1,726.5 $ 4,892.9 $ 4,942.0
Segment operating income 131.4 173.2 268.4 301.9
Interest expense (31.6) (32.9) (96.9) (97.9)
Interest income 6.7 9.7 21.4 27.7
Other income, net 1.7 137.1 5.1 136.3
Income before income taxes 108.2 287.1 198.0 368.0
Depreciation and amortization of fixed assets and intangible assets 37.4 36.2 108.8 109.5
Capital expenditures 41.1 30.2 99.3 83.3
IAN
        
Segments:        
Segment revenue 1,332.5 1,432.7 3,999.7 4,140.3
Segment operating income 116.6 180.8 278.6 343.3
Depreciation and amortization of fixed assets and intangible assets 30.1 29.9 88.4 90.6
Capital expenditures 19.9 19.3 52.6 56.1
CMG
        
Segments:        
Segment revenue 337.9 293.8 893.2 801.7
Segment operating income 34.4 27.9 73.1 66.4
Depreciation and amortization of fixed assets and intangible assets 3.9 3.1 10.6 9.5
Capital expenditures 11.9 3.3 17.5 7.5
Corporate and other
        
Segments:        
Segment operating income (19.6) (35.5) (83.3) (107.8)
Depreciation and amortization of fixed assets and intangible assets 3.4 3.2 9.8 9.4
Capital expenditures $ 9.3 $ 7.6 $ 29.2 $ 19.7