Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue recognized that was previously included in unearned revenue	$ 26.0	$ 7.2	$ 142.8	$ 46.6
Contract assets recorded within Prepaid expenses and other current assets	2.1		2.1		$ 0.1
Unearned revenue	$ 176.0		$ 176.0		$ 159.1
Revenue from Contract with Customer Benchmark \| Geographic Concentration Risk \| Outside the United States
Disaggregation of Revenue [Line Items]
Concentration risk (as a percent)	9.00%	9.00%	9.00%	8.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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