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Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill by Segment (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Goodwill gross $ 2,574.1 $ 2,578.6
Accumulated impairment losses (2,166.6) (2,174.1)
Goodwill 407.5 404.5
Foreign exchange 3.0  
Business Services    
Goodwill [Line Items]    
Goodwill gross 2,054.6 2,059.1
Accumulated impairment losses (1,912.5) (1,920.0)
Goodwill 142.1 139.1
Foreign exchange 3.0  
Marketing Solutions    
Goodwill [Line Items]    
Goodwill gross 519.5 519.5
Accumulated impairment losses (254.1) (254.1)
Goodwill $ 265.4 $ 265.4