Property and Equipment (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Net book value	$ 73.7	$ 79.1
Depreciation	40.1	36.5	$ 25.2
Cost of Sales [Member]
Property, Plant and Equipment [Line Items]
Depreciation	10.3	7.7
Software Development
Property, Plant and Equipment [Line Items]
Net book value	34.8	41.3
Software Development Work-in-Progress
Property, Plant and Equipment [Line Items]
Net book value	$ 6.4	$ 3.1