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Significant Accounting Policies Significant Accounting Policies ASU Impact (Detail) (USD $) In Millions, except Per Share data, 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
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income | $ (425.4) | $ 205.6 | $ 229.8 | $ 225.4 | $ 225.8 | $ 220.8 | $ 209.7 | $ 229.8 | $ 235.4 | $ 886.1 | $ 852.6
Earnings Per Share, Diluted | $ (1.45) | $ 0.69 | $ 0.75 | $ 0.72 | $ 0.71 | $ 0.68 | $ 0.63 | $ 0.69 | $ 0.78 | $ 2.71 | $ 2.57
Impairment of Deferred Acquisition Costs |  |  |  |  |  |  |  |  | 289.8 | 0 | 0
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 284.2 | 878.7 | 847.3
Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | $ 0.94 | $ 2.69 | $ 2.55
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  |  |  |  |  |  |  |  | (12.1) | (7.4) | (5.3)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share |  |  |  |  |  |  |  |  | $ (0.04) | $ (0.02) | $ (0.02)
Impact of Restatement on Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | $ 0.62 | $ 0.00 | $ 0.00
Impairment of Deferred Acquisition Costs |  |  |  |  |  |  |  |  | 188.4 | 0 | 0
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impact of Restatement on Earnings Per Share, Diluted |  |  |  |  |  |  |  |  | $ (0.42) | $ 0.00 | $ 0.00
Impairment of Deferred Acquisition Costs |  |  |  |  |  |  |  |  | $ (127.5) | $ 0 | $ 0

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 20 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 7 -Paragraph 18 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -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. + Details
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