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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Apr. 30, 2021	Dec. 31, 2020
Supplemental Financial Information [Abstract]
Income Taxes Receivable, Current	$ 64.8		$ 66.8
Deferred Income Tax Assets, Net	59.7		21.9
Operating Lease, Right-of-Use Asset	20.5		35.8
Supplemental executive retirement plan assets	0.0		22.6
Other	31.0		29.1
OTHER ASSETS	$ 176.0	$ 165.3	$ 176.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	OTHER ASSETS		OTHER ASSETS

X

- Definition

The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Amount of lessee's right to use underlying asset under operating lease.

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Indicates line item in statement of financial position that includes operating lease right-of-use asset.

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Amount of noncurrent assets classified as other.

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Supplemental Financial Information [Abstract]

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