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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Supplemental Financial Information [Abstract]
Deferred tax assets	$ 33.1	$ 38.8
Intangible Assets, Net (Excluding Goodwill)	5.4	15.7
Deferred costs	21.1	37.4
Supplemental executive retirement plan assets	30.5	30.9
Other	14.4	17.4
Other assets, net	$ 104.5	$ 140.2

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Assets Noncurrent Other

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Supplemental Financial Information [Abstract]

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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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Amount of deferred cost, excluding capitalized cost related to contract with customer; classified as noncurrent.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences and carryforwards, classified as noncurrent.

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