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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Supplemental Financial Information [Abstract]
Unrecognized tax benefits (inclusive of interest and penalties)	$ 173.1	$ 177.0
Deferred Tax Liabilities, Net, Noncurrent	75.5	70.7
Intangible Liabilities Noncurrent	52.7	53.5
Operating Lease, Liability, Noncurrent	41.1	0.0
Supplemental executive retirement plan liabilities	30.3	28.1
Personnel costs	27.8	25.1
Deferred revenue	17.8	20.5
Deferred Rent Credit, Noncurrent	0.0	11.7
Other	9.0	9.4
Other liabilities	$ 427.3	$ 396.0

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Supplemental Executive Retirement Plan Liabilities

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Supplemental Financial Information [Abstract]

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For a classified balance sheet, the cumulative difference between the rental income or 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, by the lessor or lessee, respectively, more than one year after the balance sheet date.

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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.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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