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Parent Company Cash Flow Statement (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items] |  |  |
Net Cash Provided by Operating Activities | $ 1,193.7 | $ 1,196.8 | $ 1,237.0
Cash Flows from Investing Activities |  |  |
Proceeds from Sales of Fixed Maturity Securities | 1,181.9 | 1,122.8 | 1,427.2
Proceeds from Maturities of Fixed Maturity Securities | 1,692.7 | 2,192.8 | 1,132.5
Purchase of Fixed Maturity Securities | (2,760.1) | (3,798.6) | (3,848.8)
Purchase of Other Investments | (304.1) | (332.8) | (267.7)
Net Sales (Purchases) of Short-term Investments | (254.6) | (288.1) | 199.0
Other, Net | (98.0) | (110.1) | (106.6)
Net Cash Provided by (Used in) Investing Activities | (410.3) | (1,073.7) | (1,213.9)
Cash Flows from Financing Activities |  |  |
Net Short-term Debt Repayments | (87.2) | 0 | 190.5
Issuance of Long-term Debt | 0 | 396.9 | 346.8
Long-term Debt Repayments | (84.4) | (78.3) | (59.8)
Issuance of Common Stock | 14.8 | 10.0 | 8.0
Dividends Paid to Stockholders | (121.0) | (114.8) | (104.5)
Purchases of Treasury Stock | 619.9 | 356.0 | 0
Other, Net | 2.9 | 1.1 | (1.5)
Net Cash Provided by (Used in) Financing Activities | (720.4) | (141.1) | (1.5)
Increase (Decrease) in Cash | 63.0 | (18.0) | 21.7
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net Cash Provided by Operating Activities | 792.9 | 490.1 | 324.1
Cash Flows from Investing Activities |  |  |
Proceeds from Sales of Fixed Maturity Securities | 133.9 | 3.8 | 49.7
Proceeds from Maturities of Fixed Maturity Securities | 44.5 | 47.4 | 24.7
Purchase of Fixed Maturity Securities | 0 | (106.5) | (299.2)
Purchase of Other Investments | (3.0) | (22.9) | 0
Net Sales (Purchases) of Short-term Investments | 192.8 | (266.7) | (145.1)
Cash Distributions to Subsidiaries | (166.1) | (2.4) | (1.3)
Short-term Notes Receivable from Subsidiaries | 0.2 | 13.3 | (10.5)
Acquisition of Property and Equipment | (46.2) | (70.0) | (54.7)
Other, Net | 0 | (18.5) | 0
Net Cash Provided by (Used in) Investing Activities | 156.1 | (422.5) | (436.4)
Cash Flows from Financing Activities |  |  |
Net Short-term Debt Repayments | (222.6) | 0 | (132.2)
Issuance of Long-term Debt | 0 | 396.9 | 346.8
Long-term Debt Repayments | 0 | (10.0) | (1.8)
Issuance of Common Stock | 14.8 | 10.0 | 8.0
Dividends Paid to Stockholders | (121.0) | (114.8) | (104.5)
Purchases of Treasury Stock | (619.9) | (356.0) | 0
Other, Net | 0 | 5.6 | (0.7)
Net Cash Provided by (Used in) Financing Activities | (948.7) | (68.3) | 115.6
Increase (Decrease) in Cash | $ 0.3 | $ (0.7) | $ 3.3

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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18, 19, 20 -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 FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a -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 -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -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 Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -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 Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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