Commitments and Contingent Liabilities Commitments and Contingent Liabilities - Additional Information (Details) - Settled Litigation - Unfavorable Regulatory Action $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Loss Contingencies
Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset	$ 44.0
Loss Contingency, Loss in Period, Tax	7.2
Net of Tax
Loss Contingencies
Loss Contingency, Loss in Period	$ 13.4

Loss Contingency, Loss in Period, Tax

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The amount of insurance-related assessment liability that is expected to be recovered through a premium tax offset based on current laws applied to in-force policies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 405
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392405&loc=d3e24119-109301

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- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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