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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
Jun. 30, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Premium and fees receivables $ 5,142.2 $ 4,082.8 [1]
Other current assets 878.1 881.6 [1]
Deferred income taxes 716.3 851.6 [1]
Other noncurrent assets 586.7 567.1 [1]
Goodwill 4,403.9 4,164.8 [1]
Liabilities    
Premiums payable to underwriting enterprises 5,982.7 4,986.0 [1]
Accrued compensation and other current liabilities 844.6 947.8 [1]
Deferred revenue - current/unearned fees 395.2 355.3 [1]
Deferred revenue - noncurrent 76.6 75.3 [1]
Other noncurrent liabilities 931.2 1,112.6 [1]
Stockholders' equity    
Retained earnings 1,466.0 1,221.8 [1]
Accumulated other comprehensive loss (651.4) (555.4) [1]
Stockholders' equity attributable to controlling interests 4,443.6 4,235.6 [1]
Stockholders' equity attributable to noncontrolling interests $ 69.5 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 ASC 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 ASC 606.