Business Combinations, Goodwill and Intangible Assets - Schedule of Gross Carrying Amount and Accumulated Amortization By Major Intangible Asset Class (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Amount	$ 43.9	$ 43.9
Accumulated Amortization	(17.2)	(14.3)
Intangible Assets, Net	$ 26.7	$ 29.6
Customer relationships
Finite Lived Intangible Assets [Line Items]
Weighted- Average Amortization Period (in years)	24 years	24 years
Gross Amount	$ 36.1	$ 36.1
Accumulated Amortization	(14.2)	(12.7)
Intangible Assets, Net	$ 21.9	$ 23.4
Trade Name
Finite Lived Intangible Assets [Line Items]
Weighted- Average Amortization Period (in years)	10 years	10 years
Gross Amount	$ 2.4	$ 2.4
Accumulated Amortization	(0.6)	(0.3)
Intangible Assets, Net	$ 1.8	$ 2.1
Non-compete Agreement
Finite Lived Intangible Assets [Line Items]
Weighted- Average Amortization Period (in years)	5 years	5 years
Gross Amount	$ 5.4	$ 5.4
Accumulated Amortization	(2.4)	(1.3)
Intangible Assets, Net	$ 3.0	$ 4.1