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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Supplemental Financial Information [Abstract]
Tax receivables	$ 61.1	$ 36.3
Right-of-use assets	53.9	58.1
Supplemental executive retirement plan assets	21.2	26.0
Deferred tax assets	19.0	26.6
Intangible assets	10.4	11.9
Deferred costs	7.3	7.1
Other	14.1	22.3
Other assets, net	$ 187.0	$ 188.3

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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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