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Goodwill and Other Intangible Assets - Schedule of Carrying Value of Goodwill by Segment (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Goodwill [Line Items]    
Goodwill gross $ 2,599.6 $ 2,595.6
Accumulated impairment losses (2,191.2) (2,185.0)
Goodwill 408.4 410.6
Foreign exchange (2.2)  
Business Services    
Goodwill [Line Items]    
Goodwill gross 2,080.1 2,076.1
Accumulated impairment losses (1,937.1) (1,930.9)
Goodwill 143.0 145.2
Foreign exchange (2.2)  
Marketing Solutions    
Goodwill [Line Items]    
Goodwill gross 519.5 519.5
Accumulated impairment losses (254.1) (254.1)
Goodwill $ 265.4 $ 265.4