Fair Value of Financial Instruments - Quantitative Estimates for Level 3 Assets (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2013	Dec. 31, 2012
US Treasury and Government \| Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
U.S. government and agency	$ 59.1	$ 25.9
State and political subdivision \| Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
State and political subdivision	45.5	58.0
Corporate \| Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Corporate	801.0	649.6
Other asset-backed \| Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Other asset-backed	11.5	2.8
Fair value investments \| Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value investments	0.8	0.8
CDO/CLO \| Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
CDO/CLO		$ 3.4
Market Approach Valuation Technique \| US Treasury and Government
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	2.83%	2.57%
Market Approach Valuation Technique \| US Treasury and Government \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	1.08%	1.46%
Market Approach Valuation Technique \| US Treasury and Government \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	4.01%	3.29%
Market Approach Valuation Technique \| State and political subdivision
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	3.57%	2.94%
Market Approach Valuation Technique \| State and political subdivision \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	2.36%	1.94%
Market Approach Valuation Technique \| State and political subdivision \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	4.23%	3.53%
Market Approach Valuation Technique \| Corporate
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	3.60%	3.01%
Market Approach Valuation Technique \| Corporate \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	1.19%	1.47%
Market Approach Valuation Technique \| Corporate \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	6.44%	6.33%
Income Approach Valuation Technique \| Other asset-backed
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	2.37%	4.97%
Prepayment rate	2.00%	2.00%
Default rate	2.53%	2.53%
Default rate term 2	0.37%	0.33%
Recovery rate	10.00%	10.00%
Income Approach Valuation Technique \| Other asset-backed \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	2.23%	2.61%
Income Approach Valuation Technique \| Other asset-backed \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Yield	3.13%	9.50%
Income Approach Valuation Technique \| Fair value investments
Fair Value, Option, Quantitative Disclosures [Line Items]
Default rate	0.35%	0.24%
Recovery rate	45.00%	45.00%
Income Approach Valuation Technique \| Collateralized Loan Obligations
Fair Value, Option, Quantitative Disclosures [Line Items]
Prepayment rate		20.00%
Default rate		2.50%
Recovery rate		65.00%
Income Approach Valuation Technique \| High Yield Bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Recovery rate		35.00%
Income Approach Valuation Technique \| Investment Grade Bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Recovery rate		45.00%
Income Approach Valuation Technique \| CDO/CLO
Fair Value, Option, Quantitative Disclosures [Line Items]
Reinvestment spread		4.00%

Fair Value Inputs, Probability of Default, Term Two

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- Definition

Fair Value Inputs, Recovery Rate

+ References

No definition available.

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- Definition

Fair Value Inputs, Reinvestment Rate

+ References

No definition available.

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- Definition

Fair Value Inputs, Yield Rate

+ References

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- Definition

No authoritative reference available.

+ References

No definition available.

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- Definition

No authoritative reference available.

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No definition available.

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- Definition

Investments in notes or bonds that are collateralized by a specific group of underlying assets owned by the issuer of the notes or bonds which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

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- Definition

The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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- Definition

The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

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- Definition

Bonds or similar securities issued by state, city, or local governments or the agencies operated by state, city, or local governments which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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