Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 40.0	$ 40.0
Accumulated Amortization	13.8	12.3
Net	$ 26.2	27.7
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization Years	0 years
Gross Carrying Amount	$ 6.7	6.7
Accumulated Amortization	6.7	6.2
Net	$ 0.0	0.5
Permits
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization Years	18 years
Gross Carrying Amount	$ 31.7	31.7
Accumulated Amortization	6.9	5.9
Net	$ 24.8	25.8
Other
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization Years	26 years
Gross Carrying Amount	$ 1.6	1.6
Accumulated Amortization	0.2	0.2
Net	$ 1.4	$ 1.4