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Summary of Significant Accounting Policies:Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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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 | 348.5 | 420.0
Money Market Funds [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |
Financial Instruments [Line Items] |  |
Cash equivalents, fair value | $ 954.4 | $ 701.6

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