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Goodwill and Other Intangible Assets - Schedule of Changes in the Carrying Value of Goodwill by Segment (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]      
Goodwill gross $ 2,583.7 $ 2,595.6 $ 2,578.6
Accumulated impairment losses (2,178.3) (2,185.0) (2,174.1)
Goodwill 405.4 410.6 404.5
Foreign exchange and other adjustments (5.2) 6.1  
Business Services      
Goodwill [Line Items]      
Goodwill gross 2,064.2 2,076.1 2,059.1
Accumulated impairment losses (1,924.2) (1,930.9) (1,920.0)
Goodwill 140.0 145.2 139.1
Foreign exchange and other adjustments (5.2) 6.1  
Marketing Solutions      
Goodwill [Line Items]      
Goodwill gross 519.5 519.5 519.5
Accumulated impairment losses (254.1) (254.1) (254.1)
Goodwill $ 265.4 $ 265.4 $ 265.4