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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following tables present financial assets and liabilities measured and recorded at fair value on our Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of December 31, 2021 and December 31, 2020:
 
Recurring Fair Value Measurements
December 31, 2021 (in millions)
Quoted Prices
in Active Markets
for Identical Assets
(Level 1)		Significant Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Balance as of
December 31, 2021
Assets
Risk management assets$— $24.4 $— $24.4 
Available-for-sale debt securities— 171.8 — 171.8 
Total$— $196.2 $— $196.2 
Liabilities
Risk management liabilities$— $144.2 $— $144.2 
Total$— $144.2 $— $144.2 
 
Recurring Fair Value Measurements
December 31, 2020 (in millions)
Quoted Prices
in Active Markets
for Identical Assets
(Level 1)		Significant Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Balance as of
December 31, 2020
Assets
Risk management assets$— $13.2 $— $13.2 
Available-for-sale debt securities— 170.9 — 170.9 
Total$— $184.1 $— $184.1 
Liabilities
Risk management liabilities$— $222.8 $— $222.8 
Total$— $222.8 $— $222.8 
Debt Securities, Available-for-sale
The amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value of available-for-sale securities at December 31, 2021 and 2020 were: 
December 31, 2021 (in millions)
Amortized
Cost		Gross
Unrealized
Gains
Gross
Unrealized
Losses(1)
Allowance for Credit LossesFair Value
Available-for-sale debt securities
U.S. Treasury debt securities$52.8 $0.1 $(0.4)$— $52.5 
Corporate/Other debt securities116.5 3.7 (0.7)(0.2)119.3 
Total$169.3 $3.8 $(1.1)$(0.2)$171.8 
December 31, 2020 (in millions)
Amortized
Cost		Gross
Unrealized
Gains
Gross
Unrealized
Losses(2)
Allowance for Credit LossesFair Value
Available-for-sale debt securities
U.S. Treasury debt securities$33.7 $0.3 $— $— $34.0 
Corporate/Other debt securities130.2 7.7 (0.5)(0.5)136.9 
Total$163.9 $8.0 $(0.5)$(0.5)$170.9 
(1) Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is $36.2 and $35.4 million, respectively, at December 31, 2021.
(2) Fair value of U.S. Treasury debt securities and Corporate/Other debt securities in an unrealized loss position without an allowance for credit losses is zero and $13.2 million, respectively, at December 31, 2020.
Carrying Amount And Estimated Fair Values Of Financial Instruments
The carrying amount and estimated fair values of these financial instruments were as follows: 
At December 31, (in millions)
Carrying
Amount
2021
Estimated
Fair Value
2021
Carrying
Amount
2020
Estimated
Fair Value
2020
Long-term debt (including current portion)$9,241.5 $10,415.7 $9,243.1 $11,034.2