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Leases - Right of Use Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Leases    
Total finance lease right of use assets $ 124.0 $ 57.0
Other Noncurrent Assets    
Leases    
Operating lease right of use assets 19.5 20.7
Power purchase commitment    
Leases    
Under finance lease 214.4 140.3
Accumulated amortization (137.7) (132.3)
Total finance lease right of use assets 76.7 8.0
Two Creeks    
Leases    
Under finance lease 9.6 7.7
Accumulated amortization (0.4) (0.2)
Total finance lease right of use assets 9.2 7.5
Badger Hollow I    
Leases    
Under finance lease 16.6 19.5
Accumulated amortization (0.9) (0.6)
Total finance lease right of use assets 15.7 18.9
Badger Hollow II    
Leases    
Under finance lease 22.8 22.8
Accumulated amortization (0.7) (0.2)
Total finance lease right of use assets 22.1 22.6
Other, finance lease    
Leases    
Under finance lease $ 0.3 $ 0.0