Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Trade names, carrying value	$ 23.3	$ 23.3
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets at cost	21.7	21.7
Amortization expense	1.7	1.8	$ 1.6
Accumulated amortization	$ 17.8	$ 16.1
Amortization period	3 years 3 months 18 days	4 years