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Note 3. Derivative Instruments and Fair Value Measurements Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 57.9 $ 124.9
Restricted Cash Fair Value Disclosure 111.4 171.6
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 1.2 0.0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 0.0  
Other Assets [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 169.3 296.5
Other Assets [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 1.2 0.0
Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 28.0 12.9
Interest Rate Swap [Member] | Accrued Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Liability $ 28.0 $ 12.9