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Supplemental Financial Information (Other Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Supplemental Financial Information [Abstract]
Unrecognized tax benefits (inclusive of interest and penalties)	$ 138.5	$ 142.9
Deferred revenue	80.5	120.9
Supplemental executive retirement plan liabilities	30.3	28.9
Personnel costs	13.8	13.5
Other	22.8	16.3
Other liabilities	$ 285.9	$ 322.5

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Supplemental Executive Retirement Plan Liabilities

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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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Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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