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Restructuring and Impairment Activities - Restructuring Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Reserve [Roll Forward]    
Balance at beginning of year $ 0.5 $ 1.4
Accruals for announced programs 11.9 3.7
Cash payments (5.2) (4.2)
Other 0.0 (0.4)
Exchange rate impacts 0.2 0.0
Balance at end of period $ 7.4 $ 0.5