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Investments (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Investments [Abstract] |  |
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of, various counterparties | $ 5,700.0 | $ 4,400.0
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities | 2,000.0 | 1,700.0
Reverse repurchase agreements | $ 3.7 | $ 30.0
Minimum percentage of collateral required | 102.00% |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=75763970&loc=SL75763979-209797 + Details
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