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Investments (Schedule of Fixed Maturities) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities | $ 5,060.0 | $ 5,021.6
Fair Value | 5,301.2 | 5,382.7
Investments in Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities | 5,060.0 | 5,021.6
Gross unrealized gains | 289.2 | 380.6
Gross unrealized loss | 48.0 | 19.5
Fair Value | 5,301.2 | 5,382.7
U.S. Government and Government Agencies and Authorities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities | 663.2 | 542.7
Gross unrealized gains | 14.5 | 19.6
Gross unrealized loss | 15.9 | 6.2
Fair Value | 661.8 | 556.1
States and Political Subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities | 1,461.7 | 1,595.5
Gross unrealized gains | 83.3 | 108.6
Gross unrealized loss | 8.3 | 2.3
Fair Value | 1,536.7 | 1,701.8
Foreign Governments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities | 3.1 | 3.0
Gross unrealized gains | 0.1 | 0.2
Gross unrealized loss | 0.0 | 0.0
Fair Value | 3.2 | 3.2
Bonds and Notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities | 2,712.7 | 2,745.8
Gross unrealized gains | 185.8 | 245.8
Gross unrealized loss | 23.7 | 11.0
Fair Value | 2,874.8 | 2,980.6
Redeemable Preferred Stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities |  | 0.1
Gross unrealized gains |  | 0.0
Gross unrealized loss |  | 0.0
Fair Value |  | 0.1
Collateralized Loan Obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities | 214.3 | 134.1
Gross unrealized gains | 4.9 | 5.7
Gross unrealized loss | 0.1 | 0.0
Fair Value | 219.1 | 139.8
Other Mortgage- and Asset-backed |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments in Fixed Maturities | 5.0 | 0.4
Gross unrealized gains | 0.6 | 0.7
Gross unrealized loss | 0.0 | 0.0
Fair Value | $ 5.6 | $ 1.1

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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