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Income taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Income Tax Disclosure
Beginning Balance	$ 16.3	$ 16.3	$ 16.3	$ 7.7	$ 7.5	$ 7.2
Addition for tax positions		0.0	0.0		0.2	0.3
Reduction as a result of lapse of statute of limitations	(1.5)			0.0
Ending Balance	$ 14.8	$ 16.3	$ 16.3	$ 7.7	$ 7.7	$ 7.5

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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