Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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Financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer.

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Earnings Per Share (Narrative) (Details) shares in Millions		3 Months Ended
Earnings Per Share (Narrative) (Details) shares in Millions	Aug. 02, 2019 USD ($) shares	Mar. 31, 2020 shares	Mar. 31, 2019 shares	Sep. 30, 2009 USD ($)
Debt Instrument [Line Items]
Exchangeable surplus notes (in shares)		0.0	6.1
Undistributed earnings allocated to participating unvested share-based payment awards, weighted outstanding shares		5.1	4.6
Long-term Debt \| Exhangeable Surplus Notes
Debt Instrument [Line Items]
Debt instrument, face amount \| $				$ 500,000,000
Surplus notes principal amount, for each \| $	$ 1,000
Interest rate				5.36%
Debt Instrument, Convertible, Conversion Ratio	12.3877
Exchangeable surplus notes (in shares)	6.2