Description of the Business and Summary of Significant Accounting Policies - Advertising Costs and Derivative Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Marketing and Advertising Expense [Abstract]
Advertising costs	$ 23.0	$ 53.2	$ 41.2
Interest Expense [Member] | Derivatives in Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Estimated reclassification from AOCI to interest expenses	$ (16.0)