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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
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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

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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 http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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