Commitments and Contingencies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Other Commitments [Line Items]
Unemployment benefits, possible liability with a change in control	$ 32.8
Unemployment benefits, possible liability without a change in control	$ 14.3
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%