Supplemental lease information (Details) $ in Millions	6 Months Ended
Jun. 30, 2019 USD ($)
Supplemental lease information [Line Items]
Operating cash flows from finance leases	$ 0.1
Operating cash flows from operating leases	13.6
Financing cash flows from finance leases	$ 0.4
Weighted-average remaining lease term - finance leases	3 years 1 month 6 days
Weighted-average remaining lease term - operating leases	5 years 1 month 6 days
Weighted-average discount rate - finance leases	8.10%
Weighted-average discount rate - operating leases	6.30%

[Line Items] for Additional lease information [Table]

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- Definition

Amount of interest paid on finance lease liability.

+ References

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Amount of cash outflow for principal payment on finance lease.

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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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