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SCHEDULE I SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Summary of investments other than investments in related parties |  |  |
Fair value investments | $ 3,208.3 | $ 2,547.3 | $ 1,543.5
Cost | 3,279.6 |  |
Carrying Value | 3,380.7 |  |
Fair Value | 3,380.7 |  |
Fixed maturity investments |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 2,117.2 |  |
Carrying Value | 2,129.7 |  |
Fair Value | 2,129.7 |  |
U.S. Government and agency obligations |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 297.8 |  |
Carrying Value | 296.5 |  |
Fair Value | 296.5 |  |
Debt securities issued by corporations |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 867.6 |  |
Carrying Value | 880.9 |  |
Fair Value | 880.9 |  |
Mortgage and asset-backed securities |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 697.2 |  |
Carrying Value | 694.7 |  |
Fair Value | 694.7 |  |
Municipal obligations |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 252.0 |  |
Carrying Value | 254.9 |  |
Fair Value | 254.9 |  |
Foreign government, agency and provincial obligations |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 2.6 |  |
Carrying Value | 2.7 |  |
Fair Value | 2.7 |  |
Short-term investments |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 176.1 |  |
Carrying Value | 176.1 |  |
Fair Value | 176.1 |  |
Exchange Traded Funds |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 512.5 |  |
Carrying Value | 569.7 |  |
Fair Value | 569.7 |  |
Common equity securities |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 739.7 |  |
Carrying Value | 866.1 |  |
Fair Value | 866.1 |  |
Banks, trust and insurance companies |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 12.8 |  |
Carrying Value | 16.3 |  |
Fair Value | 16.3 |  |
Industrial, miscellaneous and other |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 214.4 |  |
Carrying Value | 280.1 |  |
Fair Value | 280.1 |  |
Other long-term investments |  |  |
Summary of investments other than investments in related parties |  |  |
Cost | 246.6 |  |
Carrying Value | 208.8 |  |
Fair Value | 208.8 |  |
Fair value measured on a recurring basis |  |  |
Summary of investments other than investments in related parties |  |  |
Fair value investments | 3,259.1 | 2,639.7 |
Fair value measured on a recurring basis | Other long-term investments |  |  |
Summary of investments other than investments in related parties |  |  |
Fair value investments | 87.2 | 91.4 |
Level 3 | Other long-term investments |  |  |
Summary of investments other than investments in related parties |  |  |
Fair value investments | 87.2 | 91.4 | $ 103.6
Level 3 | Fair value measured on a recurring basis |  |  |
Summary of investments other than investments in related parties |  |  |
Fair value investments | 87.2 | 91.4 |
Level 3 | Fair value measured on a recurring basis | Foreign Exchange Forward [Member] |  |  |
Summary of investments other than investments in related parties |  |  |
Fair value investments | (3.7) | (1.2) |
Level 3 | Fair value measured on a recurring basis | Other long-term investments |  |  |
Summary of investments other than investments in related parties |  |  |
Fair value investments | $ 87.2 | $ 91.4 |

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