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Investments (Schedule of Fixed Maturities) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | $ 6,266.9 | $ 6,284.5
Fair Value | 6,573.1 | 6,424.2
Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 6,266.9 | 6,284.5
Gross unrealized gains | 340.8 | 226.3
Gross unrealized loss | 34.6 | 86.6
Fair Value | 6,573.1 | 6,424.2
U.S. Government and Government Agencies and Authorities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 845.9 | 865.9
Gross unrealized gains | 20.2 | 14.8
Gross unrealized loss | 7.7 | 15.0
Fair Value | 858.4 | 865.7
States and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 1,582.2 | 1,553.7
Gross unrealized gains | 101.4 | 74.0
Gross unrealized loss | 1.7 | 8.6
Fair Value | 1,681.9 | 1,619.1
Foreign Governments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 5.8 | 6.5
Gross unrealized gains | 0.0 | 0.0
Gross unrealized loss | 0.6 | 0.6
Fair Value | 5.2 | 5.9
Bonds and Notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 3,281.5 | 3,307.8
Gross unrealized gains | 216.4 | 135.1
Gross unrealized loss | 17.8 | 49.1
Fair Value | 3,480.1 | 3,393.8
Collateralized Loan Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 536.8 | 535.7
Gross unrealized gains | 1.5 | 1.5
Gross unrealized loss | 6.8 | 13.2
Fair Value | 531.5 | 524.0
Other Mortgage- and Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investments in Fixed Maturities | 14.7 | 14.9
Gross unrealized gains | 1.3 | 0.9
Gross unrealized loss | 0.0 | 0.1
Fair Value | $ 16.0 | $ 15.7

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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