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Variable Interest Entities (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Income Tax Expense (Benefit) | $ (1,600,000) | $ 13,700,000 |
Other Assets | 556,000,000.0 |  | $ 575,900,000
Variable Interest Entity, Not Primary Beneficiary |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Variable Interest Entity, Funding Investment Commitment, Funding | 48,500,000 |  | 20,000,000.0
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments | 0 |  | 0
Income (Loss) from Equity Method Investments | (15,400,000) |  | 0
Income Tax Credits and Adjustments | 28,400,000 |  | 3,600,000
Income Tax Expense (Benefit) | 200,000 |  | $ (400,000)
Cash and Cash Equivalents, at Carrying Value | 7,200,000 |  |
Property, Plant and Equipment, Net | 54,400,000 |  |
Other Assets | 600,000 |  |
Assets | 62,200,000 |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | $ 54,400,000 |  |

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