Other Assets and Liabilities - Other Non-Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Other Assets and Other Liabilities [Abstract]
Right of use assets	$ 88.8	$ 87.9
Prepaid pension assets	17.1	9.9
Investments	28.0	23.7
Other non-current assets	13.5	13.1
Total	147.4	$ 134.6
Right-of-use assets related to a new lease and a lease modified during period	$ 11.4