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Parent Company Statement of Income (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  | $ 249.1 | $ 241.6 | $ 257.2
Total Revenue | 2,604.8 | 2,545.6 | 2,564.5 | 2,563.1 | 2,593.1 | 2,527.9 | 2,510.6 | 2,561.6 | 10,278.0 | 10,193.2 | 10,091.0
Income (Loss) Before Income Tax | (704.3) | 293.3 | 338.0 | 330.2 | 335.5 | 326.5 | 308.1 | 361.2 | 257.2 | 1,331.3 | 1,292.3
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 21.8 | 445.2 | 439.7
Net Income | (425.4) | 205.6 | 229.8 | 225.4 | 225.8 | 220.8 | 209.7 | 229.8 | 235.4 | 886.1 | 852.6
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends from Subsidiaries |  |  |  |  |  |  |  |  | 800.0 | 576.0 | 313.8
Interest from Subsidiaries |  |  |  |  |  |  |  |  | 0.6 | 0.6 | 0.5
Other Income |  |  |  |  |  |  |  |  | 64.4 | 56.1 | 47.8
Total Revenue |  |  |  |  |  |  |  |  | 865.0 | 632.7 | 362.1
Interest and Debt Expense |  |  |  |  |  |  |  |  | 112.1 | 112.3 | 90.2
Other Expenses |  |  |  |  |  |  |  |  | 57.7 | 47.6 | 63.9
Total Expenses |  |  |  |  |  |  |  |  | 169.8 | 159.9 | 154.1
Income (Loss) Before Income Tax |  |  |  |  |  |  |  |  | 695.2 | 472.8 | 208.0
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (13.9) | (3.6) | (9.5)
Income Before Equity in Undistributed Earnings (Loss) of Subsidiaries |  |  |  |  |  |  |  |  | 709.1 | 476.4 | 217.5
Equity in Undistibuted Earnings (Loss) of Subsidiaries |  |  |  |  |  |  |  |  | (473.7) | 409.7 | 635.1
Net Income |  |  |  |  |  |  |  |  | $ 235.4 | $ 886.1 | $ 852.6

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph h -Subparagraph 1(i) 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)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 9 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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