Other Assets and Liabilities - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Other Assets and Other Liabilities [Abstract]
Deferred revenue - long term	$ 13.7	$ 7.8
U.S. tax liability associated with the 2017 Act	49.8	55.0
Long-term lease liability	73.1	71.2
Other	11.1	3.7
Total	147.7	$ 137.7
Long-term lease liability related to a new lease and a lease modified during period	$ 11.9