Other Long-term Liabilities - Changes in Deferred Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities Noncurrent [Abstract]
Balance at beginning of period	$ 168.5	$ 172.0
Additions	7.2	0.3
Revenue recognized	(3.9)	(3.8)	$ (3.9)
Balance at end of period	$ 171.8	$ 168.5	$ 172.0