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Revenues, Unbilled Revenue and Deferred Revenue (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Contracts with Customers, Assets and Liabilities [Abstract]
Unbilled revenue	$ 188.6	$ 0.0
Deferred revenue	285.6	$ 224.7
Other Current Assets [Member]
Contracts with Customers, Assets and Liabilities [Abstract]
Unbilled revenue (current amount)	188.6
Other Assets [Member]
Contracts with Customers, Assets and Liabilities [Abstract]
Unbilled revenue (noncurrent)	0.0
Other Current Liabilities [Member]
Contracts with Customers, Assets and Liabilities [Abstract]
Deferred revenue (current amount)	94.4
Other Liabilities [Member]
Contracts with Customers, Assets and Liabilities [Abstract]
Deferred revenue (noncurrent)	$ 191.2

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