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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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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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