Property, Plant and Equipment, and right-of-use assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 75.3	$ 78.2	$ 77.0
Operating and finance lease, right-of-use asset, cost price	36.1
Operating and finance lease, right-of-use asset, accumulated depreciation	8.5
Operating and finance lease, net carrying amount	$ 27.5