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Intangible Assets (Gross and Net Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 40.0 | $ 40.0
Accumulated Amortization | 10.2 | 8.2
Total | $ 29.8 | 31.8
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted - Average Remaining Amortization Years | 2 years |
Gross Carrying Amount | $ 6.7 | 6.7
Accumulated Amortization | 5.6 | 5.0
Total | $ 1.1 | 1.7
Permits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted - Average Remaining Amortization Years | 20 years |
Gross Carrying Amount | $ 31.7 | 31.7
Accumulated Amortization | 4.5 | 3.1
Total | $ 27.2 | 28.6
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted - Average Remaining Amortization Years | 28 years |
Gross Carrying Amount | $ 1.6 | 1.6
Accumulated Amortization | 0.1 | 0.1
Total | $ 1.5 | $ 1.5

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 + Details
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