Balance Sheet Classification (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Total operating lease liabilities	$ 19.5	$ 19.0
Other assets
Operating lease, right of use asset	15.9	15.6
Accrued liabilities
Operating lease, current liability	5.2	5.5
Other liabilities
Operating lease, noncurrent liability	$ 14.3	$ 13.5