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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.

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