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Exit or Disposal Cost Obligations (Tables)
3 Months Ended
Mar. 31, 2021
Restructuring and Related Activities [Abstract]  
Rollforward of liability balances for exit or disposal cost obligations The following is a rollforward of liability balances for exit or disposal cost obligations associated with the closing of the ACP business.
Contract Termination ChargesOther Associated Closing Costs Involuntary Termination Benefits Total
Balance at December 31, 2020$0.2 $2.4 $0.8 $3.4 
Costs incurred — — — — 
Costs paid or otherwise settled(0.2)(2.4)(0.7)(3.3)
Balance at March 31, 2021
$— $— $0.1 $0.1