Supplemental Financial Data - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Text Block Supplement [Abstract]
Deferred revenue - long term	$ 16.3	$ 7.8	$ 7.3
U.S. tax liability associated with the 2017 Act	49.8	55.0
Long-term lease liability	68.4	71.2
Other	8.7	3.7
Total	$ 143.2	$ 137.7