Postretirement Benefits Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Settlement Loss	$ 0.0	$ (1.1)	$ 292.8
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Cost	0.4	0.7	6.0
Expected Return on Plan Assets	0.0	0.0	(7.4)
Amortization of Prior Service Credits	0.0	0.0	0.0
Amortization of Net Actuarial Losses	0.8	0.6	5.8
Settlement Loss	0.0	(1.1)	292.8
Net Pension and Other Benefit Costs	1.2	0.2	297.2
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest Cost	0.0	0.8	1.3
Expected Return on Plan Assets	0.0	0.0	0.0
Amortization of Prior Service Credits	0.0	(0.7)	(0.7)
Amortization of Net Actuarial Losses	0.0	0.0	0.0
Settlement Loss	0.0	0.0	0.0
Net Pension and Other Benefit Costs	$ 0.0	$ 0.1	$ 0.6