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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities        
Net earnings $ 123.7 $ 78.3 [1] $ 409.7 $ 320.3 [1]
Adjustments to reconcile net earnings to net cash provided by operating activities:        
Net change in premiums and fees receivable       (1,534.4)
Net change in deferred revenue     32.4 29.7 [1]
Net change in premiums payable to underwriting enterprises     1,106.9 1,379.4 [1]
Net change in other current assets     1.0 33.3 [1]
Net change in accrued compensation and other current liabilities     (135.7) (57.8) [1]
Net change in deferred income taxes     (146.4) (90.5) [1]
Net change in other noncurrent assets and liabilities     $ (65.7) (20.2) [1]
As Previously Reported [Member]        
Cash flows from operating activities        
Net earnings   180.4   248.2
Adjustments to reconcile net earnings to net cash provided by operating activities:        
Net change in premiums and fees receivable       (478.7)
Net change in premiums payable to underwriting enterprises       445.1
Net change in other current assets       (17.4)
Net change in accrued compensation and other current liabilities       (77.0)
Net change in deferred income taxes       (72.9)
Net change in other noncurrent assets and liabilities       (18.4)
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Cash flows from operating activities        
Net earnings   $ (102.1)   72.1
Adjustments to reconcile net earnings to net cash provided by operating activities:        
Net change in premiums and fees receivable       (1,055.7)
Net change in deferred revenue       29.7
Net change in premiums payable to underwriting enterprises       934.3
Net change in other current assets       50.7
Net change in accrued compensation and other current liabilities       19.2
Net change in deferred income taxes       (17.6)
Net change in other noncurrent assets and liabilities       $ (1.8)
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.