Retirement and Employee Benefit Plans (Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Total change in value of pension and postretirement liabilities	$ 31.0	$ 13.0	$ (5.0)
Other postretirement benefit, tax effects	1.1	0.4
Pension benefit, tax effects		2.7
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain arising during the year	30.0	5.0
Amortization of prior service cost	(2.0)	0.0
Amortization of net loss	0.0	1.0
Settlements	(1.0)	5.0
Less: Tax effect (1)	0.0	0.0
Total change in value of pension and postretirement liabilities	27.0	11.0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain arising during the year	4.0	2.0
Amortization of prior service cost	0.0	0.0
Amortization of net loss	0.0	0.0
Settlements	0.0	0.0
Less: Tax effect (1)	0.0	0.0
Total change in value of pension and postretirement liabilities	$ 4.0	$ 2.0