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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 8.7 $ 10.0 $ 13.5
Amounts Recorded in Earnings 6.6 4.2 5.8
Adjustments (5.2) (5.5) (9.3)
Balance at End of Year 10.1 8.7 10.0
Allowance for Estimated Policy Cancellations [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 8.3 7.8 7.4
Amounts Recorded in Earnings 4.1 0.5 (1.2)
Adjustments (2.5)   1.6
Balance at End of Year 9.9 8.3 7.8
Valuation Allowance for Deferred Tax Assets [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 80.5 67.4 79.1
Amounts Recorded in Earnings 14.4 13.1 (11.7)
Balance at End of Year 94.9 80.5 67.4
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 2,087.5 1,750.4 1,490.7
Amounts Recorded in Earnings 417.3 334.0 291.2
Adjustments 32.2 3.1 (31.5)
Balance at End of Year $ 2,537.0 $ 2,087.5 $ 1,750.4