Equity Investments - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
	Apr. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Gain on marketable equity investment		$ 14.7	$ 101.2
GDS
Schedule of Equity Method Investments [Line Items]
Price per ordinary share (in dollars per share)		$ 57.97
Equity method investment, share equivalent (shares)		2.3
Equity investments		$ 133.4		$ 118.7
Affiliated Entity | ODATA
Schedule of Equity Method Investments [Line Items]
Cost method investments		$ 19.7		$ 16.4
Subsequent Event | Affiliated Entity | ODATA
Schedule of Equity Method Investments [Line Items]
Payments of capital contribution	$ 1.4