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Lease Accounting (Lease Cost) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Operating lease cost $ 8.9 $ 3.9
Finance lease cost    
Amortization of leased assets 2.6 0.3
Interest on lease liabilities 1.4 0.0
Net lease costs $ 12.9 $ 4.2