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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 12.8 $ 13.3 $ 10.7
Amounts Recorded in Earnings 5.4 4.9 5.7
Adjustments (4.7) (5.4) (3.1)
Balance at End of Year 13.5 12.8 13.3
Allowance for Estimated Policy Cancellations [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 7.1 7.4 6.8
Amounts Recorded in Earnings 2.1 0.2 3.6
Adjustments (1.8) (0.5) (3.0)
Balance at End of Year 7.4 7.1 7.4
Valuation Allowance for Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 66.8 52.8 73.7
Amounts Recorded in Earnings 12.3 14.0 (20.9)
Balance at End of Year 79.1 66.8 52.8
Accumulated Amortization of Expiration Lists, Noncompete Agreements and Trade Names [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 1,203.6 983.9 758.8
Amounts Recorded in Earnings 264.7 247.2 240.3
Adjustments 22.4 (27.5) (15.2)
Balance at End of Year $ 1,490.7 $ 1,203.6 $ 983.9