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Cash and cash equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents
Cash deposits	$ 118.7	$ 60.3
Term deposits	13.4	9.4
Cash and cash equivalents	$ 132.1	$ 69.7	$ 511.1

X

- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

No definition available.

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- Definition

A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents]

+ References

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