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Investments (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Municipal Bonds [Member]
Investments
Total fixed maturity securities	$ 5,166.8	$ 5,052.0
Amortized Cost	4,772.9	4,719.9
Municipal Bonds [Member] \| Texas
Investments
Total fixed maturity securities	796.8	773.9
Amortized Cost	734.1	724.0
Municipal Bonds [Member] \| New York
Investments
Total fixed maturity securities	736.9	695.2
Amortized Cost	687.1	653.8
Municipal Bonds [Member] \| California
Investments
Total fixed maturity securities	422.3	366.8
Amortized Cost	383.2	336.2
Municipal Bonds [Member] \| Florida
Investments
Total fixed maturity securities	342.2	343.3
Amortized Cost	310.5	316.9
Municipal Bonds [Member] \| Illinois
Investments
Total fixed maturity securities	291.1	300.2
Amortized Cost	268.8	281.5
Municipal Bonds [Member] \| WASHINGTON
Investments
Total fixed maturity securities	241.3	213.7
Amortized Cost	224.5	199.7
Municipal Bonds [Member] \| Massachusetts
Investments
Total fixed maturity securities	221.7	215.9
Amortized Cost	200.8	198.9
Municipal Bonds [Member] \| Arizona
Investments
Total fixed maturity securities	176.5	172.3
Amortized Cost	163.9	163.0
Municipal Bonds [Member] \| Ohio
Investments
Total fixed maturity securities		138.6
Amortized Cost		128.8
Municipal Bonds [Member] \| Georgia
Investments
Total fixed maturity securities	150.1
Amortized Cost	142.7
Municipal Bonds [Member] \| Michigan
Investments
Total fixed maturity securities	140.8	136.2
Amortized Cost	131.2	128.5
Municipal Bonds [Member] \| All others
Investments
Total fixed maturity securities	1,647.1	1,695.9
Amortized Cost	1,526.1	1,588.6
Pre Refunded Bond [Member]
Investments
Total fixed maturity securities	509.9	403.4
State General Obligation
Investments
Total fixed maturity securities	551.0	558.9
State General Obligation \| Texas
Investments
Total fixed maturity securities	88.2	86.3
State General Obligation \| New York
Investments
Total fixed maturity securities	12.5	12.3
State General Obligation \| California
Investments
Total fixed maturity securities	19.0	19.1
State General Obligation \| Florida
Investments
Total fixed maturity securities	34.5	34.2
State General Obligation \| Illinois
Investments
Total fixed maturity securities	14.2	16.2
State General Obligation \| WASHINGTON
Investments
Total fixed maturity securities	38.4	37.8
State General Obligation \| Massachusetts
Investments
Total fixed maturity securities	43.3	42.5
State General Obligation \| Arizona
Investments
Total fixed maturity securities	0	0
State General Obligation \| Ohio
Investments
Total fixed maturity securities		0
State General Obligation \| Georgia
Investments
Total fixed maturity securities	12.4
State General Obligation \| Michigan
Investments
Total fixed maturity securities	0	0
State General Obligation \| All others
Investments
Total fixed maturity securities	288.5	310.5
Local General Obligation
Investments
Total fixed maturity securities	1,008.0	1,033.4
Local General Obligation \| Texas
Investments
Total fixed maturity securities	337.9	342.0
Local General Obligation \| New York
Investments
Total fixed maturity securities	70.0	60.3
Local General Obligation \| California
Investments
Total fixed maturity securities	74.5	50.9
Local General Obligation \| Florida
Investments
Total fixed maturity securities	62.5	61.7
Local General Obligation \| Illinois
Investments
Total fixed maturity securities	81.9	86.9
Local General Obligation \| WASHINGTON
Investments
Total fixed maturity securities	45.4	52.5
Local General Obligation \| Massachusetts
Investments
Total fixed maturity securities	9.8	9.7
Local General Obligation \| Arizona
Investments
Total fixed maturity securities	7.7	7.7
Local General Obligation \| Ohio
Investments
Total fixed maturity securities		52.7
Local General Obligation \| Georgia
Investments
Total fixed maturity securities	29.5
Local General Obligation \| Michigan
Investments
Total fixed maturity securities	29.2	37.2
Local General Obligation \| All others
Investments
Total fixed maturity securities	259.6	271.8
Revenue bonds
Investments
Total fixed maturity securities	3,607.8	3,459.7
Amortized Cost	3,337.8	3,242.8
Revenue bonds \| Transportation
Investments
Total fixed maturity securities	789.5	717.4
Amortized Cost	726.4	669.7
Revenue bonds \| Tax Backed
Investments
Total fixed maturity securities	764.3	800.0
Amortized Cost	706.9	748.7
Revenue bonds \| Municipal utilities
Investments
Total fixed maturity securities	577.5	530.4
Amortized Cost	538.3	500.7
Revenue bonds \| Water and sewer
Investments
Total fixed maturity securities	549.4	528.8
Amortized Cost	505.9	493.5
Revenue bonds \| Higher Education
Investments
Total fixed maturity securities	408.0	332.1
Amortized Cost	374.7	307.2
Revenue bonds \| Healthcare
Investments
Total fixed maturity securities	307.9	273.4
Amortized Cost	285.9	257.6
Revenue bonds \| All other revenue sources
Investments
Total fixed maturity securities	211.2	277.6
Amortized Cost	199.7	265.4
Revenue bonds \| Texas
Investments
Total fixed maturity securities	370.7	345.6
Revenue bonds \| New York
Investments
Total fixed maturity securities	654.4	622.6
Revenue bonds \| California
Investments
Total fixed maturity securities	328.8	296.8
Revenue bonds \| Florida
Investments
Total fixed maturity securities	245.2	247.4
Revenue bonds \| Illinois
Investments
Total fixed maturity securities	195.0	197.1
Revenue bonds \| WASHINGTON
Investments
Total fixed maturity securities	157.5	123.4
Revenue bonds \| Massachusetts
Investments
Total fixed maturity securities	168.6	163.7
Revenue bonds \| Arizona
Investments
Total fixed maturity securities	168.8	164.6
Revenue bonds \| Ohio
Investments
Total fixed maturity securities		85.9
Revenue bonds \| Georgia
Investments
Total fixed maturity securities	108.2
Revenue bonds \| Michigan
Investments
Total fixed maturity securities	111.6	99.0
Revenue bonds \| All others
Investments
Total fixed maturity securities	$ 1,099.0	$ 1,113.6

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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