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Summary of Significant Accounting Policies (Schedule of Trust Assets and Reinsurance Liabilities) (Details) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Restricted cash and cash equivalents		$ 316.7	$ 224.7
Restricted securities available for sale	[1]	$ 46.7	$ 45.3
[1] Measured and recorded at fair value on a recurring basis.

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- References

No definition available.

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The carrying amount of securities categorized neither as held-to-maturity nor trading which serve as security for borrowings or other arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 10
-Section S99
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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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