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Investment Securities (Investment Gains (Losses) For Level 3) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investment securities |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | $ (267.3) | $ 152.9 | $ (79.3)
Realized gains | 315.5 | 112.9 | 194.0
Realized losses | 35.2 | 35.6 | 27.2
Level 3 Inputs |  |  |
Investment securities |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | 6.2 | (23.1) | 7.7
Fixed maturity investments |  |  |
Investment securities |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | (12.1) | (15.6) | 11.3
Fixed maturity investments | Level 3 Inputs |  |  |
Investment securities |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | 0.1 | (1.1) | 1.9
Common equity securities |  |  |
Investment securities |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | (254.6) | 207.6 | (83.0)
Common equity securities | Level 3 Inputs |  |  |
Investment securities |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | 0.0 | (9.0) | 5.8
Other long-term investments |  |  |
Investment securities |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | (0.6) | (39.1) | (7.6)
Other long-term investments | Level 3 Inputs |  |  |
Investment securities |  |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) | $ 6.1 | $ (13.0) | $ 0.0

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- Definition This item represents the gain 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 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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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 -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: 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=73527792&loc=d3e27357-111563 + Details
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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 4: 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=73527792&loc=d3e27357-111563 + Details
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