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Summary of Significant Accounting Policies:Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
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	420.0	432.0
Money Market Funds [Member] | Fair Value, Recurring [Member] | Level 1 [Member]
Financial Instruments [Line Items]
Cash equivalents, fair value	$ 701.6	$ 371.8

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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