Variable Interest Entities - Assets and Liabilities and Associated Maximum Loss Exposure of Alternative Energy Partnership Investments (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Other assets	$ 592,200,000	$ 575,900,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Cash	21,500,000
Equipment, net of depreciation	310,500,000
Other assets	3,000,000.0
Total unconsolidated assets	335,000,000.0
Maximum loss exposure	$ 39,600,000

Amount of net assets (liabilities).

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