Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of insurance recoveries related to business interruption losses and property losses

	Balance at				Insurance
	Beginning of				Proceeds		Insurance			Balance at
	Period		Additions		Received		Gain (Loss)			End of Period
Insurance recovery receivable:
Year ended December 31, 2020	$	13.5	$	—	$	(29.9)	$	16.4	(1)	$	—
Year ended December 31, 2019	$	—	$	25.8	$	(11.3)	$	(1.0)	(2)	$	13.5

(1) Represents recoveries for business interruption losses and property losses in excess of incurred losses of $15.6 million and $0.8 million, respectively. Of the $15.6 million recorded for the recovery of business interruption losses, $6.0 million relates to the expected reduction in capacity payments in 2021 under the Cadillac PPA due to the reduced availability of the plant in 2020 during the extended outage.

(2) Represents the $1.0 million property damage deductible.

Management Service Commitments

Schedule of estimated commitments under fuel supply and transportation agreements

2021	$	0.4
2022		0.2
2023		—
2024		—
2025		—
Thereafter		—
	$	0.6

Fuel Supply and Transportation Commitments

Schedule of estimated commitments under fuel supply and transportation agreements

2021	$	4.2
2022		4.4
2023		—
2024		—
2025		—
Thereafter		—
	$	8.6