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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Supplemental Financial Information [Abstract]
Tax receivables	$ 66.3	$ 66.8
Right-of-use assets	39.0	35.8
Deferred Income Tax Assets, Net	22.7	21.9
Supplemental executive retirement plan assets	18.7	22.6
Other	25.8	29.1
Other assets, net	$ 172.5	$ 176.2

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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Amount of noncurrent assets classified as other.

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