Geographic Information - Revenue by Selected Geographic Area Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 586.3	$ 781.6	$ 1,244.0	$ 1,512.7
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	248.1	395.0	548.0	778.9
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 338.2	$ 386.6	$ 696.0	$ 733.8