Commitments and contingencies (Tables)

9 Months Ended

Sep. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Changes in Total Environmental Liabilities

Changes in total environmental liabilities are as follows:

(in millions)
Environmental liabilities at December 31, 2019	$	78.7
Revised obligation estimates	16.0
Environmental payments	(9.5)
Foreign exchange	0.2
Environmental liabilities at September 30, 2020	$	85.4

Schedule of Environmental Liabilities

(in millions)	Balance Sheet Classification	September 30, 2020		December 31, 2019
Current environmental liabilities	Other accrued expenses	$	27.8	$	25.0
Long-term environmental liabilities	Other long-term liabilities	57.6		53.7