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Segment information - Information About Unconsolidated Equity Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Carrying value of investments at year end	$ 5.0	$ 4.9	$ 4.0
Undistributed earnings	3.2	3.5	2.6
Share in earnings of equity affiliates	0.9	1.9	$ 0.4
Rest of World \| Reportable Segments
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Carrying value of investments at year end	4.4	4.2
Undistributed earnings	2.6	2.8
Share in earnings of equity affiliates	0.6	0.9
South America \| Reportable Segments
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Carrying value of investments at year end	0.6	0.7
Undistributed earnings	0.6	0.7
Share in earnings of equity affiliates	$ 0.3	$ 1.0

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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