Segments - Geographic (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Total net revenues	$ 1,001.7	$ 1,082.6
Total Americas
Segment Reporting Information [Line Items]
Total net revenues	543.6	587.6
United States
Segment Reporting Information [Line Items]
Total net revenues	476.6	532.3
Other
Segment Reporting Information [Line Items]
Total net revenues	67.0	55.3
Europe, Middle East, and Africa
Segment Reporting Information [Line Items]
Total net revenues	286.2	308.0
Asia Pacific
Segment Reporting Information [Line Items]
Total net revenues	$ 171.9	$ 187.0