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Investment Securities (Investment gains (losses) for Level 3) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Unrealized gains (losses) on investments | $ 50.8 | $ (230.1)
Fixed maturity investments. |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Unrealized gains (losses) on investments | 17.5 | 21.7
Common equity securities |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Unrealized gains (losses) on investments | 29.1 | (249.8)
Other long-term investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Unrealized gains (losses) on investments | 4.2 | (2.0)
Level 3 Inputs |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Unrealized gains (losses) on investments | (1.7) | 1.6
Level 3 Inputs | Fixed maturity investments. |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Unrealized gains (losses) on investments | 0.2 | 0.5
Level 3 Inputs | Other long-term investments |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Unrealized gains (losses) on investments | $ (1.9) | $ 1.1

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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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