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Investments Schedule of Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Schedule of Equity Securities [Abstract] |  |
Equity Securities at Fair Value | $ 568.2 |
Equity Securities at Fair Value |  | $ 526.0
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount | 0.2 |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount | 0.0 |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount | 0.0 |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount | $ 0.2 |

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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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