Derivative Instruments (Narrative) (Details)	Oct. 30, 2021 USD ($)
Notes due 2021 [Member]
Derivative [Line Items]
Debt Instrument, Face Amount	$ 650,000,000
Notes due 2028 [Member]
Derivative [Line Items]
Debt Instrument, Face Amount	$ 500,000,000

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

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant