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Benefit Plans, Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in Plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Amortization of prior service credit (gain) loss	$ (8.4)	$ (10.0)	$ (7.1)
Total recognized in other comprehensive income	(45.2)	18.7	$ 16.1
Pension Benefits [Member]
Changes in Plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Current year actuarial gain (loss)	36.7	(29.6)
Amortization of actuarial (gain) loss	9.0	10.5
Amortization of prior service credit (gain) loss	0.0	0.0
Total recognized in other comprehensive income	45.7	(19.1)
Post-Retirement Benefits [Member]
Changes in Plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Current year actuarial gain (loss)	0.1	0.9
Amortization of actuarial (gain) loss	(0.6)	(0.5)
Amortization of prior service credit (gain) loss	0.0	0.0
Total recognized in other comprehensive income	$ (0.5)	$ 0.4

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Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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

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