Future minimum lease payments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019
Future minimum lease payments [Line Items]
Finance Lease, Liability		$ 2.8
Operating Lease, Liability		93.7
Forecast [Member]
Future minimum lease payments [Line Items]
Short-term Lease Payments	$ 5.0
Finance Lease [Member]
Future minimum lease payments [Line Items]
2019 (excluding the nine months ended September 30, 2019)		0.3
2020		1.1
2021		1.0
2022		0.9
2023		0.9
Thereafter		0.0
Total future undiscounted minimum lease payments		4.2
Less: impact of discounting		(1.4)
Finance Lease, Liability		2.8
Operating lease [Member]
Future minimum lease payments [Line Items]
2019 (excluding the nine months ended September 30, 2019)		6.9
2020		25.6
2021		18.1
2022		14.5
2023		9.7
Thereafter		38.9
Total future undiscounted minimum lease payments		113.7
Less: impact of discounting		(20.0)
Operating Lease, Liability		$ 93.7

[Line Items] for Future minimum lease payments [Table]

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in remainder of fiscal year following latest fiscal year ended.

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