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Pension Benefits and Postretirement Benefits Other Than Pensions - Pension Income (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Interest Cost on Projected Benefit Obligation	$ 1.8	$ 4.5
Expected Return on Plan Assets	(2.3)	(7.3)
Amortization of Net Actuarial Loss	0.7	1.5
Total Pension (Benefit) Expense	$ 0.2	$ (1.3)

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