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Income Taxes Reconciliation of Provision (Benefit) for income Taxes Reported in Consolidated Statements Of Income with Tax at Statutory Rate (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Income before income taxes $ 1,911.6 $ 1,907.4 $ 1,720.0
Tax at statutory rate 669.1 667.6 602.0
Dividends received deduction (19.8) (18.3) (17.6)
Exempt interest income (17.8) (13.8) (13.1)
Tax-deductible dividends (7.9) (6.5) (13.6)
Other items, net (1.0) (2.6) (3.1)
Income Tax Expense (Benefit) $ 611.1 $ 626.4 $ 554.6
Tax at statutory rate 35.00% 35.00% 35.00%
Dividends received deduction (1.00%) (1.00%) (1.00%)
Exempt interest income (1.00%) (1.00%) (1.00%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount $ (13.8) $ 0.0 $ 0.0
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent (1.00%) (0.00%) (0.00%)
Tax-deductible dividends (0.00%) (0.00%) (1.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount $ 2.3 $ 0.0 $ 0.0
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent (0.00%) (0.00%) (0.00%)
Other items, net 0.00% 0.00% 0.00%
Total income tax provision 32.00% 33.00% 32.00%