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Revenue from Contracts with Customers - Summary of Consolidated Statement of Cash Flows Line Items, which Reflect Adoption of New Revenue Recognition Guidance (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities    
Net earnings $ 286.0 $ 242.0 [1]
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Net change in premiums receivable (1,505.4) (1,559.4) [1]
Net change in deferred revenue 29.3 22.3 [1]
Net change in premiums payable to underwriting enterprises 979.4 1,119.0 [1]
Net change in other current assets 119.1 98.2 [1]
Net change in accrued compensation and other current liabilities (165.4) 65.4 [1]
Net change in deferred income taxes (75.6) (44.0) [1]
Net change in other noncurrent assets and liabilities $ (12.4) (29.0) [1]
As Previously Reported [Member]    
Cash flows from operating activities    
Net earnings   67.8
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Net change in premiums receivable   (206.3)
Net change in premiums payable to underwriting enterprises   (30.1)
Net change in other current assets   56.2
Net change in accrued compensation and other current liabilities   43.1
Net change in deferred income taxes   (17.2)
Net change in other noncurrent assets and liabilities   (28.0)
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Cash flows from operating activities    
Net earnings   174.2
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Net change in premiums receivable   (1,353.1)
Net change in deferred revenue   22.3
Net change in premiums payable to underwriting enterprises   1,149.1
Net change in other current assets   42.0
Net change in accrued compensation and other current liabilities   22.3
Net change in deferred income taxes   (26.8)
Net change in other noncurrent assets and liabilities   $ (1.0)
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.