Employee Benefit Plans - 401(k) plan, Deferred Compensation Plan and Non-US Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Benefit Textuals [Abstract]
Employee contribution matched	30.00%
Matching contributions to plan	$ 22.0	$ 20.2	$ 20.2
NQDC
Employee Benefit Textuals [Abstract]
Deferred compensation liability	29.3	26.8
Investment	29.3	26.8
Prepaid expenses and other current assets | NQDC
Employee Benefit Textuals [Abstract]
Investment	3.1	4.1
Other long-term assets | NQDC
Employee Benefit Textuals [Abstract]
Investment	26.2	22.7
Other accrued liabilities | NQDC
Employee Benefit Textuals [Abstract]
Deferred compensation liability	3.1	4.1
Other long-term liabilities | NQDC
Employee Benefit Textuals [Abstract]
Deferred compensation liability	$ 26.2	$ 22.7