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Note 1. Summary of Significant Accounting Policies Lessor Accounting (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Operating and Sales-Type Leases, Lessor Disclosure [Table Text Block] The Leasing Group primarily enters into operating leases. Future contractual minimum rental revenues on operating leases related to our wholly-owned and partially-owned subsidiaries are as follows:
20212022202320242025ThereafterTotal
 (in millions)
Future contractual minimum rental revenues$550.4 $432.8 $322.3 $237.9 $160.9 $290.6 $1,994.9