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Summary of Significant Accounting Policies:Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Reported Value Measurement [Member] | 4.875% Senior Notes Due 2030 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Fixed-rate debt | $ 400.0 | $ 400.0
Level 2 [Member] | Estimate of Fair Value Measurement [Member] | 4.875% Senior Notes Due 2030 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Fixed-rate debt | 428.0 | 432.0
Fair Value, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |
Cash equivalents, fair value | $ 710.7 | $ 371.8

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