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Financing: Long-term debt (Details) - Senior Unsecured Notes Due 2024 $ in Millions	Aug. 26, 2021 USD ($)
Debt Instrument, Face Amount	$ 600.0
Debt Instrument, Interest Rate, Stated Percentage	1.037%
Debt Instrument, Term	3 years
Debt Issuance Costs, Net	$ 3.7

X

- Definition

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

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X

- Definition

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

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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