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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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