Debt (Schedule of Debt Issuance Costs) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Issuance Costs [Roll Forward]
Debt issuance costs, beginning balance	$ 6.9	$ 9.3
Impact and debt issuance costs, debt financing arrangements	5.9	2.7
Loss on debt extinguishment	(0.7)	(1.8)
Amortization of debt issuance costs	(2.6)	(2.5)
Debt issuance costs, ending balance	9.1	6.9
Financing Arrangement, January 2019
Debt Issuance Costs [Roll Forward]
Impact and debt issuance costs, debt financing arrangements		2.6
Financing Arrangement, February 2017
Debt Issuance Costs [Roll Forward]
Loss on debt extinguishment		(2.3)
Financing Arrangement, July 2019
Debt Issuance Costs [Roll Forward]
Loss on debt extinguishment		$ (0.2)
Financing Arrangement, June 2020
Debt Issuance Costs [Roll Forward]
Impact and debt issuance costs, debt financing arrangements	5.2
Term Loan A
Debt Issuance Costs [Roll Forward]
Write off of deferred debt issuance cost	$ (0.4)

Debt Issuance Costs [Roll Forward]

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Amount of amortization expense attributable to debt issuance costs.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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