Goodwill and intangible assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Basis of presentation
Increase in gross carrying amount of intangible asset	$ 263.2
Amortization of intangible assets	$ 92.6	$ 71.4
Weighted average amortization period	14 years 10 days
Number of years of forecasting	9 years
Colorado
Basis of presentation
Impairment losses	$ 13.9
Massachusetts
Basis of presentation
Impairment losses	19.4
Colorado
Basis of presentation
Impairment losses	0.3
North Dakota and Oregon
Basis of presentation
Impairment losses	$ 3.6
International
Basis of presentation
Number of years of forecasting	13 years

The period of forecasting of cash flow for reportable units.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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