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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
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Premium and fees receivables $ 4,857.5 $ 4,082.8 [1]  
Other current assets 1,024.4 881.6 [1]  
Deferred income taxes 806.2 851.6 [1]  
Other noncurrent assets 573.6 567.1 [1]  
Goodwill 4,625.6 4,164.8 [1] $ 3,753.2
Liabilities      
Premiums payable to underwriting enterprises 5,740.2 4,986.0 [1]  
Accrued compensation and other current liabilities   947.8  
Deferred revenue - current/unearned fees 379.3 355.3 [1]  
Deferred revenue - noncurrent 78.4 75.3 [1]  
Other noncurrent liabilities 900.9 1,112.6 [1]  
Stockholders' equity      
Retained earnings 1,558.6 1,221.8 [1]  
Accumulated other comprehensive loss (785.6) (555.4) [1]  
Stockholders' equity attributable to controlling interests 4,498.9 4,235.6 [1]  
Stockholders' equity attributable to noncontrolling interests $ 70.8 64.1 [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.