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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 13.5 $ 12.8 $ 13.3
Amounts Recorded in Earnings 5.8 5.4 4.9
Adjustments (9.3) (4.7) (5.4)
Balance at End of Year 10.0 13.5 12.8
Allowance for Estimated Policy Cancellations [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 7.4 7.1 7.4
Amounts Recorded in Earnings (1.2) 2.1 0.2
Adjustments 1.6 (1.8) (0.5)
Balance at End of Year 7.8 7.4 7.1
Valuation Allowance for Deferred Tax Assets [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 79.1 66.8 52.8
Amounts Recorded in Earnings (11.7) 12.3 14.0
Balance at End of Year 67.4 79.1 66.8
Accumulated Amortization of Expiration Lists, Noncompete Agreements and Trade Names [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 1,490.7 1,203.6 983.9
Amounts Recorded in Earnings 291.3 264.7 247.2
Adjustments (31.6) 22.4 (27.5)
Balance at End of Year $ 1,750.4 $ 1,490.7 $ 1,203.6