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Pension and Other Postretirement Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net (Gain) Loss	$ (32.7)	$ 8.1
Amortization of Prior Service Cost	7.6	8.0
Amortization of Loss	(3.0)	(1.0)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities	(28.1)	15.1
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net (Gain) Loss	(20.1)	68.4
Amortization of Prior Service Cost	0.2	0.2
Amortization of Loss	(18.8)	(12.8)
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities	$ (38.7)	$ 55.8

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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