Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Commitments to be paid	$ 10.5
Commitments to be paid in 2020	7.3
Commitments to be paid in 2021	3.0
Commitments to be paid in 2022	0.2
Employees under contract terminated by employer without good cause or change in control	39.4
Employees under contract terminated by employer without good cause or in absence of change in control	16.5
Letter of Credit | Line of Credit
Other Commitments [Line Items]
Letters of credit outstanding	$ 3.4	$ 3.2
Minimum
Other Commitments [Line Items]
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements	6 months
Severance payment as a percentage of annual salary	100.00%
Severance payment as a percentage of annual bonus	50.00%
Maximum
Other Commitments [Line Items]
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements	3 years
Severance payment as a percentage of annual salary	300.00%
Severance payment as a percentage of annual bonus	300.00%