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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Supplemental Financial Information [Abstract]
Deferred revenue	$ 139.2	$ 218.6
Unrecognized tax benefits (inclusive of interest and penalties)	154.0	149.7
Supplemental executive retirement plan liabilities	29.4	34.4
Deferred Tax Liabilities, Net, Noncurrent	9.3	4.4
Personnel costs	11.3	17.7
Other	10.9	24.4
Other liabilities	$ 354.1	$ 449.2

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Supplemental Financial Information [Abstract]

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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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