Supplemental cash flow information - Cash and cash equivalents - (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2016	Dec. 31, 2015
Supplemental cash flow information
Cash and cash equivalents	$ 19.1	$ 14.1	$ 30.0
Bank overdrafts		(17.9)
Total cash and cash equivalents	$ 19.1	$ (3.8)		$ 30.0

The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents]

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

The amount of cash and cash equivalents in the statement of cash flows when different from the amount of cash and cash equivalents in the statement of financial position. [Refer: Cash and cash equivalents]

+ References

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- Definition

N/A.

+ References

No definition available.

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