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.

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Subsequent events (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
Subsequent events (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of business		$ 9.3		$ 0.0	$ 17.9	$ 0.0
Impairment charges		$ 19.7	$ 15.5		$ 37.6	$ 7.0
Subsequent Event \| Forecast \| Canadian Agricultural Services Business \| Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of business	$ 30.0