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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities        
Net earnings $ 138.4 $ 118.1 [1] $ 548.1 $ 438.4 [1]
Adjustments to reconcile net earnings to net cash provided by operating activities:        
Net change in premiums and fees receivable       (800.1)
Net change in deferred revenue     33.0 24.5 [1]
Net change in premiums payable to underwriting enterprises     729.1 755.6 [1]
Net change in other current assets     (76.8) 13.9 [1]
Net change in accrued compensation and other current liabilities     (56.1) (7.7) [1]
Net change in deferred income taxes     (168.4) (151.1) [1]
Net change in other noncurrent assets and liabilities     $ (12.9) (15.0) [1]
As Previously Reported [Member]        
Cash flows from operating activities        
Net earnings   137.8   386.0
Adjustments to reconcile net earnings to net cash provided by operating activities:        
Net change in premiums and fees receivable       (261.6)
Net change in premiums payable to underwriting enterprises       198.7
Net change in other current assets       (25.0)
Net change in accrued compensation and other current liabilities       (30.7)
Net change in deferred income taxes       (133.2)
Net change in other noncurrent assets and liabilities       (11.6)
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Cash flows from operating activities        
Net earnings   $ (19.7)   52.4
Adjustments to reconcile net earnings to net cash provided by operating activities:        
Net change in premiums and fees receivable       (538.5)
Net change in deferred revenue       24.5
Net change in premiums payable to underwriting enterprises       556.9
Net change in other current assets       38.9
Net change in accrued compensation and other current liabilities       23.0
Net change in deferred income taxes       (17.9)
Net change in other noncurrent assets and liabilities       $ (3.4)
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.