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Commitments and Contingent Liabilities (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2017
Commitments and Contingent Liabilities [Line Items]
Litigation and regulatory matters loss contingency, range of possible loss, maximum (less than)		$ 100.0
Commitments \| Commercial mortgage loans
Commitments and Contingent Liabilities [Line Items]
Total outstanding commercial mortgage loan commitments		26.0	$ 14.0
Commitments \| Investments
Commitments and Contingent Liabilities [Line Items]
Commitments to purchase investment (excluding commercial mortgage loans)		$ 261.0	$ 257.0
Indonesia
Commitments and Contingent Liabilities [Line Items]
Joint Venture with CT Corp, Ownership Percentage				49.00%
Settled Litigation
Commitments and Contingent Liabilities [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 5.0
Disgorgement Ruling
Commitments and Contingent Liabilities [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 27.6