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Impairments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Asset Impairment Charges [Abstract]
Total impairment charges			$ 4.0	$ 7.6	$ 0.0
Operating Lease, Liability		$ 26.1	26.1
Operating Lease, Right-of-Use Asset		17.4	17.4	23.3
Total impairment charges			4.0	7.6	$ 0.0
Operating Lease, Right-of-Use Asset		17.4	17.4	23.3
Operating Lease, Liability		26.1	$ 26.1
Mountain View California
Asset Impairment Charges [Abstract]
Total impairment charges		3.2		5.4
Total impairment charges		$ 3.2		5.4
Santa Clara California
Asset Impairment Charges [Abstract]
Total impairment charges	$ 0.8			2.2
Operating Lease, Liability						$ 4.0
Operating Lease, Right-of-Use Asset						2.4
Total impairment charges	$ 0.8			$ 2.2
Operating Lease, Right-of-Use Asset						2.4
Operating Lease, Liability						$ 4.0

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228

+ Details

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X

- References

No definition available.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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