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Stock-based compensation - expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other information about options outstanding
Expense	$ 12.7	$ 10.7
Equity
Other information about options outstanding
Expense	12.6	12.0
Liability
Other information about options outstanding
Expense	0.1	(1.3)
Stock options
Other information about options outstanding
Expense	3.6	4.0
RSUs
Other information about options outstanding
Expense	8.7	7.6
Other
Other information about options outstanding
Expense	$ 0.4	$ (0.9)

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- References

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