Share Capital (Details) - USD ($) $ in Millions		12 Months Ended
Jul. 16, 2020	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Stock Issued During Period, Shares, New Issues (in shares)				6,900,000
Proceeds from Stock Options Exercised		$ 2.7	$ 6.2	$ 1.5
The 2020 Base Shelf Prospectus [Member]
Shelf Prospectus Period (Month)	25 months
Shelf Prospectus, Maximum Amount	$ 1,000.0
Stock Issued During Period, Shares, New Issues (in shares)	0

Number of new stock issued during the period.

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(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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