Restructuring and Other Charges (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) site	Sep. 30, 2019 USD ($)
Restructuring charges
Severance-related and exit costs			$ 4.3	$ 2.6
Other charges
Corporate severance-related costs	$ 0.0	$ 0.0	0.0	3.5
Environmental remediation	0.1	0.1	0.4	0.3
Other	3.4	0.8	3.9	1.0
Total Restructuring and other charges	4.4	0.9	10.1	4.8
Exit costs			$ 1.6
Number of environmental remediation sites | site			1
Nikolov V. Livent Corp | Pending Litigation
Other charges
Net loss contingency	2.5		$ 2.5
Facility Closing
Restructuring charges
Severance-related and exit costs	$ 0.9	$ 0.0	$ 5.8	$ 0.0