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Investment Securities (Investment Gains (Losses) For Level 3) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investment securities |  |  |
Realized gains | $ 61.5 | $ 283.7 | $ 48.7
Realized losses | 37.4 | 13.7 | 18.6
Unrealized investment gains | 97.5 | (294.7) | 235.5
Level 3 Inputs |  |  |
Investment securities |  |  |
Unrealized investment gains | (15.4) | (14.2) | (8.1)
Fixed maturity investments |  |  |
Investment securities |  |  |
Unrealized investment gains | 13.8 | (14.6) | 0.1
Fixed maturity investments | Level 3 Inputs |  |  |
Investment securities |  |  |
Unrealized investment gains | 0.0 | 0.1 | 0.0
Common equity securities |  |  |
Investment securities |  |  |
Unrealized investment gains | 99.3 | (257.4) | 240.8
Common equity securities | Level 3 Inputs |  |  |
Investment securities |  |  |
Unrealized investment gains | 0.0 | 0.0 | (9.0)
Other long-term investments |  |  |
Investment securities |  |  |
Unrealized investment gains | (15.6) | (22.7) | (5.4)
Other long-term investments | Level 3 Inputs |  |  |
Investment securities |  |  |
Unrealized investment gains | $ (15.4) | $ (14.3) | $ 0.9

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- Definition This item represents the loss realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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