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Variable Interest Entities - Balance Sheets of VIEs (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]      
Cash and cash equivalents $ 526.0   $ 1,115.0
Total assets 3,961.0   9,279.0
Long-term interest-bearing debt 6,177.0   6,623.0
Other liabilities 436.0   450.0
Equity of the VIEs $ (3,140.0)   1,642.0
Variable Interest Entity, primary beneficiary      
Variable Interest Entity [Line Items]      
Cash and cash equivalents     22.0
Investment in finance lease     972.0
Total assets     994.0
Short-term interest-bearing debt     48.0
Long-term interest-bearing debt     550.0
Other liabilities     5.0
Short-term amounts due to related parties     12.0
Long-term loan due to related parties     239.0
Total liabilities of the VIEs     854.0
Equity of the VIEs   $ 137.0 $ 140.0