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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Supplemental Financial Information [Abstract]
Deferred costs	$ 30.9	$ 37.4
Supplemental executive retirement plan assets	30.1	30.9
Deferred tax assets	28.1	38.8
Intangible Assets, Net (Excluding Goodwill)	14.2	15.7
Other	16.9	17.4
Other Assets, Net	120.2	140.2
Assets Held-for-sale, Not Part of Disposal Group, Current	$ 5.2	$ 1.5

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Assets Noncurrent Other

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Supplemental Financial Information [Abstract]

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Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

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-Publisher FASB
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-Topic 360
-SubTopic 10
-Section 15
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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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Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer.

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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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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 noncurrent assets classified as other.

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