Other Long-Term Liabilities (Schedule of Other Long-Term Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Non-current lease liabilities	$ 28.8	$ 30.1
Long-term deferred compensation arrangements	13.9	14.0
Fair value of derivative liabilities	30.9	15.6
Other	9.7	8.2
Total other long-term liabilities	$ 83.3	$ 67.9