Retirement Plans (Schedule of Amounts to be Amortized From Accumulated Other Comprehensive Income) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Pension Benefits
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
Amortization of net actuarial loss (gain)	$ 0.6
Amortization of prior service credit	0.0
Postretirement Benefits
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
Amortization of net actuarial loss (gain)	(0.1)
Amortization of prior service credit	$ (1.7)