Pension and other Postretirement Benefits - Narrative (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Retirement Benefits [Abstract]
Defined Benefit Plan, Interest Cost	$ 5.5	$ 5.0
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(9.5)	(9.1)
Defined Benefit Plan, Amortization of Gain (Loss)	0.0	0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (4.0)	$ (4.0)

Amount of cost recognized for passage of time related to defined benefit plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Name:	us-gaap_DefinedBenefitPlanInterestCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration