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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Supplemental Financial Information [Abstract] |  |
Unrecognized tax benefits (inclusive of interest and penalties) | $ 177.0 | $ 178.0
Deferred Tax Liabilities, Net, Noncurrent | 70.7 | 18.5
Intangible Liabilities Noncurrent | 53.5 | 59.6
Supplemental executive retirement plan liabilities | 28.1 | 32.0
Personnel costs | 25.1 | 18.1
Deferred revenue | 20.5 | 51.2
Deferred Rent Credit | 11.7 | 17.1
Other Accrued Liabilities, Noncurrent | 9.4 | 12.2
Other liabilities | $ 396.0 | $ 386.7

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- Definition Supplemental Executive Retirement Plan Liabilities + References No definition available. + Details
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- Definition Supplemental Financial Information [Abstract] + References No definition available. + Details
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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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- Definition The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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