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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Supplemental Financial Information [Abstract]
Tax receivables	$ 65.5	$ 36.3
Right-of-use assets	41.6	58.1
Deferred Income Tax Assets, Net	42.9	26.6
Supplemental executive retirement plan assets	21.9	26.0
Intangible assets	3.1	11.9
Other	25.2	29.4
Other assets, net	$ 200.2	$ 188.3

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- 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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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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

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