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Acquisitions and Strategic Investments (Periscope) (Details) - USD ($) $ in Millions	Jan. 03, 2019	Sep. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 103.0	$ 103.0
Periscope Acquisition
Business Acquisition [Line Items]
Cash paid for acquisition	$ 121.0
Preliminary purchase price	134.0
Acquired cash	9.8
Non-cash equity incentive awards	3.2
Identifiable finite-lived intangibles acquired	69.8
Goodwill	58.5
Goodwill, tax deductible portion	$ 52.7
Minimum \| Periscope Acquisition
Business Acquisition [Line Items]
Finite-lived intangible assets useful life	5 years
Maximum \| Periscope Acquisition
Business Acquisition [Line Items]
Finite-lived intangible assets useful life	6 years