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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 8.3 $ 10.1 $ 8.7
Amounts Recorded in Earnings 6.8 7.0 6.6
Adjustments [1] (4.0) (8.8) (5.2)
Balance at End of Year 11.1 8.3 10.1
Allowance for Estimated Policy Cancellations [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 10.0 9.9 8.3
Amounts Recorded in Earnings 2.4 (1.3) 4.1
Adjustments [2] (3.1) 1.4 (2.5)
Balance at End of Year 9.3 10.0 9.9
Valuation Allowance for Deferred Tax Assets [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 154.9 94.9 80.5
Amounts Recorded in Earnings (19.7) 60.0 14.4
Balance at End of Year 135.2 154.9 94.9
Accumulated Amortization of Expiration Lists, Non-compete Agreements and Trade Names [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 2,924.0 2,537.0 2,087.5
Amounts Recorded in Earnings 454.9 415.1 417.3
Adjustments [3] (78.9) (28.1) 32.2
Balance at End of Year $ 3,300.0 $ 2,924.0 $ 2,537.0
[1] Net activity of bad debt write offs and recoveries and acquired businesses.
[2] Additions to allowance related to acquired businesses.
[3] Elimination of fully amortized expiration lists, non-compete agreements and trade names, intangible asset/amortization reclassifications and disposal of acquired businesses.