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Revenue from Contracts with Customers - Summary of Balance Sheet Line Items, which Reflect Adoption of New Revenue Recognition Guidance (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Premium and fees receivables | $ 4,872.0 | $ 4,082.8 | [1]
Other current assets | 951.5 | 881.6 | [1]
Deferred income taxes | 743.4 | 851.6 | [1]
Other noncurrent assets | 584.6 | 567.1 | [1]
Goodwill | 4,501.3 | 4,164.8 | [1]
Liabilities |  |  |
Premiums payable to underwriting enterprises | 5,693.6 | 4,986.0 | [1]
Accrued compensation and other current liabilities | 943.1 | 947.8 | [1]
Deferred revenue - current/unearned fees | 396.6 | 355.3 | [1]
Deferred revenue - noncurrent | 76.1 | 75.3 | [1]
Other noncurrent liabilities | 862.1 | 1,112.6 | [1]
Stockholders' equity |  |  |
Retained earnings | 1,517.6 | 1,221.8 | [1]
Accumulated other comprehensive loss | (673.4) | (555.4) | [1]
Stockholders' equity attributable to controlling interests | 4,544.5 | 4,235.6 | [1]
Stockholders' equity attributable to noncontrolling interests | $ 68.2 | 64.1 | [1]
Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Goodwill |  | (33.1) |
As Previously Reported [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Premium and fees receivables |  | 2,157.2 |
Other current assets |  | 708.4 |
Deferred income taxes |  | 905.1 |
Other noncurrent assets |  | 567.0 |
Goodwill |  | 4,197.9 |
Liabilities |  |  |
Premiums payable to underwriting enterprises |  | 3,475.9 |
Accrued compensation and other current liabilities |  | 864.1 |
Deferred revenue - current/unearned fees |  | 74.8 |
Other current liabilities |  | 56.4 |
Other noncurrent liabilities |  | 1,128.3 |
Stockholders' equity |  |  |
Retained earnings |  | 1,095.9 |
Accumulated other comprehensive loss |  | (559.9) |
Stockholders' equity attributable to controlling interests |  | 4,105.2 |
Stockholders' equity attributable to noncontrolling interests |  | 59.7 |
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Premium and fees receivables |  | 1,925.6 |
Other current assets |  | 173.2 |
Deferred income taxes |  | (53.5) |
Other noncurrent assets |  | 0.1 |
Goodwill |  | (33.1) |
Liabilities |  |  |
Premiums payable to underwriting enterprises |  | 1,510.1 |
Accrued compensation and other current liabilities |  | 83.7 |
Deferred revenue - current/unearned fees |  | 280.5 |
Other current liabilities |  | (56.4) |
Deferred revenue - noncurrent |  | 75.3 |
Other noncurrent liabilities |  | (15.7) |
Stockholders' equity |  |  |
Retained earnings |  | 125.9 |
Accumulated other comprehensive loss |  | 4.5 |
Stockholders' equity attributable to controlling interests |  | 130.4 |
Stockholders' equity attributable to noncontrolling interests |  | $ 4.4 |
[1] | See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.

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