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Leases - Right of Use Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Right of use assets      
Total finance lease right of use asset/capital lease asset $ 40.6   $ 19.4
Operating lease right of use assets 41.4 $ 49.0  
Power Purchase Contract      
Right of use assets      
Under finance/capital lease 140.3   140.3
Accumulated amortization (126.6)   (120.9)
Total finance lease right of use asset/capital lease asset 13.7   19.4
Two Creeks Solar Project      
Right of use assets      
Under finance/capital lease 7.7   0.0
Accumulated amortization (0.1)   0.0
Total finance lease right of use asset/capital lease asset 7.6   0.0
Badger Hollow Solar Farm I      
Right of use assets      
Under finance/capital lease 19.5   0.0
Accumulated amortization (0.2)   0.0
Total finance lease right of use asset/capital lease asset $ 19.3   $ 0.0