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Revenues, Unbilled Revenue and Deferred Revenue (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Contracts with Customers, Assets and Liabilities [Abstract]
Unbilled revenue	$ 15.0	$ 18.8	$ 17.6	$ 13.3
Deferred revenue	445.6	343.5	$ 314.9	$ 291.2
Prepaid and other current assets [Member]
Contracts with Customers, Assets and Liabilities [Abstract]
Unbilled revenue (current amount)	15.0	18.8
Other current liabilities [Member]
Contracts with Customers, Assets and Liabilities [Abstract]
Deferred revenue (current amount)	196.1	145.3
Other long-term liabilities [Member]
Contracts with Customers, Assets and Liabilities [Abstract]
Deferred revenue (noncurrent)	$ 249.5	$ 198.2

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