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Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities, Short-Term Investments and Equities (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 5,479.8 | $ 5,765.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 84.8 | 85.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (25.4) | (40.8)
Available-for-sale Securities | 5,539.2 | 5,809.9
Total fixed income securities — Available for sale |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 5,437.9 | 5,620.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 84.8 | 85.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (25.4) | (40.8)
Available-for-sale Securities | 5,497.3 | 5,664.6
Total short-term investments — Available for sale |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 41.9 | 145.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities | 41.9 | 145.3
U.S. government |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,218.3 | 1,207.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 9.2 | 9.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (6.7) | (11.2)
Available-for-sale Securities | 1,220.8 | 1,206.1
U.S. agency |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 74.4 | 117.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1.1 | 1.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities | 75.5 | 119.6
Municipal |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 30.8 | 23.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 2.0 | 1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | (0.4)
Available-for-sale Securities | 32.8 | 24.4
Corporate |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2,469.3 | 2,566.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 44.7 | 39.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (10.6) | (20.0)
Available-for-sale Securities | 2,503.4 | 2,586.5
Non-U.S. government-backed corporate |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 92.3 | 89.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.5 | 0.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (0.2) | (0.1)
Available-for-sale Securities | 92.6 | 89.8
Non-U.S. government |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 516.9 | 477.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 9.7 | 11.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (0.7) | (0.8)
Available-for-sale Securities | 525.9 | 488.7
Asset-backed |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 48.7 | 62.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.2 | 0.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities | 48.9 | 63.0
Non-agency commercial mortgage-backed |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 4.3 | 12.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities | 4.3 | 12.6
Agency mortgage-backed |  |
Statement [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 982.9 | 1,062.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 17.4 | 19.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (7.2) | (8.3)
Available-for-sale Securities | $ 993.1 | $ 1,073.9

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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