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Investments (Narratives) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017
Regulatory Capital Requirements [Abstract] |  |
Assets held by insurance regulators | $ 28.1 | $ 16.8
Fair value of sold available-for-sale securities | 35.6 |
Available-for-sale securities, gross realized gains | 1.6 |
Other-than-temporary impairments | $ 0.0 |

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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=75027294&loc=d3e22002-158495 + Details
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