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Income taxes - Reconciliation of Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 27.9	$ 35.8	$ 27.7
Additions based on tax positions related to the current year	2.6	4.2	2.7
Changes for tax positions of prior years	(6.1)	(11.2)	12.0
Reductions as a result of a lapse of applicable statute of limitations	(2.4)	(2.7)	(2.8)
Settlements	(1.5)	(0.2)	(0.1)
Changes due to foreign currency	(1.6)	2.0	(3.7)
Balance at December 31	$ 18.9	$ 27.9	$ 35.8

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- Definition

Unrecognized Tax Benefits, Increases (Decreases) Resulting From Current Period Tax Positions

+ References

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- Definition

Unrecognized Tax Benefits, Increases (Decreases) Resulting From Foreign Currency Translation

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- Definition

Unrecognized Tax Benefits, Increases (Decreases) Resulting from Prior Period Tax Positions

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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- Definition

Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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