Fair Value - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash flow hedge gain (loss) to be reclassified within 12 months			$ 1.9
Gain (loss) on derivative	$ 1.5	$ (0.5)	$ 2.2	$ (1.6)
Measurement Input, Long-term Revenue Growth Rate | Valuation Technique, Option Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded derivative liability, unobservable inputs	0.07		0.07		0.07
Measurement Input, Price Volatility | Valuation Technique, Option Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded derivative liability, unobservable inputs	0.20		0.20		0.20
Not designated as hedging instrument | Natural gas forward contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative	$ 0.7	(0.8)		(1.5)
Gain on the settlement of contracts	$ 1.2	$ 1.1	$ 3.7	$ 2.7