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Pension and Other Postretirement Benefits - Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total recognized in other comprehensive (income) loss, after taxes	$ (3.4)	$ (34.9)	$ (3.4)
Pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year net actuarial loss (gain)	18.4	(23.5)
Amortization of net actuarial (loss) gain	(23.4)	(21.3)
Amortization of prior service (cost) credit	(0.2)	(0.2)
Settlement loss	(1.0)	(0.6)
Total recognized in other comprehensive (income) loss, before taxes	(6.2)	(45.6)
Total recognized in other comprehensive (income) loss, after taxes	(5.0)	(36.5)
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current year net actuarial loss (gain)	(0.6)	0.4
Amortization of net actuarial (loss) gain	0.8	0.9
Amortization of prior service (cost) credit	0.0	0.0
Settlement loss	0.0	0.0
Total recognized in other comprehensive (income) loss, before taxes	0.2	1.3
Total recognized in other comprehensive (income) loss, after taxes	$ 0.2	$ 1.0

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Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Settlements, before Tax

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