Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2021	Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization of intangible assets	$ 6.7	$ 9.0
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Expected amortization of customer relationships in 2021		1.6
Expected amortization of customer relationships in 2022		6.3
Expected amortization of customer relationships in 2023		6.3
Expected amortization of customer relationships in 2024		6.3
Expected amortization of customer relationships in 2025		$ 6.3

Present Value Of Future Amortization, Intangible Assets, Year Five

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Present Value Of Future Amortization, Intangible Assets, Year Four

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Present Value Of Future Amortization, Intangible Assets, Year One

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Present Value Of Future Amortization, Intangible Assets, Year Three

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Present Value Of Future Amortization, Intangible Assets, Year Two

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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