Other Balance Sheet Information - Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Other Current Liabilities:
Accrued customer volume rebates	$ 18.0		$ 28.4
Accrued compensation	14.7		16.0
Income taxes payable	8.6		10.4
Accrued interest	4.2		4.2
Pension liabilities	0.9		1.2
Restructuring liability	2.8	$ 3.3	2.7
Other accrued liabilities	42.9		50.7
Total other current liabilities	$ 92.1		$ 113.6