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Summary of Significant Accounting Policies:Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Reported Value Measurement [Member] | 4.875% Senior Notes Due 2030 [Member] |  |
Financial Instruments [Line Items] |  |
Fixed-rate debt | $ 400.0 | $ 400.0
Level 2 [Member] | Estimate of Fair Value Measurement [Member] | 4.875% Senior Notes Due 2030 [Member] |  |
Financial Instruments [Line Items] |  |
Fixed-rate debt | 360.0 | 348.5
Money Market Funds [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |
Financial Instruments [Line Items] |  |
Cash equivalents, fair value | $ 1,053.8 | $ 954.4

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