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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 ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 01, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Income before income taxes | $ 2,138,900,000 | $ 1,470,700,000 | $ 1,911,600,000 |
Tax at statutory federal rate | 748,600,000 | 514,800,000 | 669,100,000 |
Net deferred tax liability revaluation1 | (99,500,000) | 0.00 | 0.00 |
Tax credits | (52,400,000) | (62,200,000) | (1,900,000) |
Stock-based compensation2 | (25,100,000) | 0 | 0 |
Dividends received deduction | (20,700,000) | (22,600,000) | (19,800,000) |
Exempt interest income | (16,900,000) | (15,700,000) | (17,800,000) |
Tax-deductible dividends | (9,700,000) | (6,100,000) | (7,900,000) |
State income taxes, net of federal taxes | 6,000,000 | 6,600,000 | 2,300,000 |
Other items, net | 400,000 | (1,800,000) | 600,000 |
Non-taxable gain4 | 0 | 0 | (13,800,000) |
Total income tax provision | $ 540,800,000 | $ 413,500,000 | $ 611,100,000 |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
Tax at statutory federal rate | 35.00% | 35.00% | 35.00% |
Net deferred tax liability revaluation1 | (5.00%) | 0.00% | 0.00% |
Tax credits | (2.00%) | (4.00%) | (0.00%) |
Stock-based compensation2 | (1.00%) | 0.00% | 0.00% |
Dividends received deduction | (1.00%) | (2.00%) | (1.00%) |
Exempt interest income | (1.00%) | (1.00%) | (1.00%) |
Tax-deductible dividends | (0.00%) | (0.00%) | (0.00%) |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | $ 10,100,000 | $ 500,000 | $ 300,000 |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent | 0.00% | 0.00% | 0.00% |
State income taxes, net of federal taxes | 0.00% | 0.00% | 0.00% |
Other items, net | 0.00% | 0.00% | 0.00% |
Non-taxable gain4 | 0.00% | 0.00% | (1.00%) |
Total income tax provision | 25.00% | 28.00% | 32.00% |
ARX Holding Corp. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership interest prior to acquisition |  |  |  | 5.00%

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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