Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity method investments	$ 7.9	$ 8.7
Equity securities without readily determinable fair value	19.3	14.6
Advertising costs	49.8	52.7	$ 54.7
Restricted cash	59.1	70.1
Foreign currency transaction gain (loss)	(5.9)	5.6	(2.6)
Non-current operating lease assets	490.7
Lease liabilities	575.7
Additional paid-in capital	2,819.5	2,791.2
Accumulated deficit	(1,297.0)	(1,298.4)
Impairment charges of intangible assets	$ 0.0	$ 0.0	$ 0.0
ownership interest	100.00%