Commitments and Contingencies - Additional Information (Details) - Apollo and Parks Township $ in Millions	1 Months Ended	3 Months Ended	11 Months Ended	99 Months Ended
	Nov. 30, 2014 USD ($)	Mar. 31, 2018 claimant lawsuit	Mar. 31, 2016 lawsuit	Mar. 31, 2018 facility claimant
Contingencies And Commitments [Line Items]
Number of lawsuits | lawsuit		17	17
Number of claimants | claimant		107		107
Number of facilities | facility				2
Recovery of damages incurred	$ 125.0
Minimum
Contingencies And Commitments [Line Items]
Recovery of damages incurred	0.0
Maximum
Contingencies And Commitments [Line Items]
Recovery of damages incurred	$ 125.0