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Contract assets and deferred revenue - Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract assets - current	$ 42.0	$ 44.3
Contract assets - long-term	17.4	20.7
Deferred revenue - current	(253.2)	(257.1)
Deferred revenue - long-term	(150.7)	(137.9)
Revenue recognized that was included in deferred revenue at the beginning of the period	$ 245.8	$ 236.1

X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

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+ References

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