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COVID-19 Repositioning Costs (Tables)
12 Months Ended
Dec. 31, 2020
COVID-19 Repositioning Costs [Abstract]  
COVID-19 Repositioning Liabilities
At December 31, 2020 the liability for the COVID-19 repositioning costs was (in millions):
Opening balance$197.0 
Payments(113.2)
December 31, 2020$83.8