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Investments (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Assets held by insurance regulators |  |  |  | $ 16.8 | $ 17.3
Fair value of sold available-for-sale securities | $ 190.2 | $ 150.7 | $ 109.1 |  |
Available-for-sale securities, gross realized gains | 5.1 | 4.2 | 4.6 |  |
Available-for-sale securities, gross realized losses | 2.2 | 0.6 | 0.7 |  |
Other-than-temporary impairments | 0.0 | 0.0 | $ 0.0 |  |
Mortgages [Member] |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |
Allowance for probable losses and any unamortized premiums or discounts | $ 0.5 | $ 0.4 |  |  |
Mortgages [Member] | Minimum [Member] |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |
Mortgage loan interest rate | 4.30% |  |  |  |
Mortgage loan maturity date | Dec. 31, 2017 |  |  |  |
Mortgages [Member] | Maximum [Member] |  |  |  |  |
Real Estate [Abstract] |  |  |  |  |
Mortgage loan interest rate | 6.90% |  |  |  |
Mortgage loan maturity date | Dec. 31, 2036 |  |  |  |

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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28366721&loc=d3e22002-158495 + Details
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- Definition The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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