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Employee Benefit Plans (Reconciliation of the Beginning and Ending Balances for Investments) (Details) - Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Change in Plan Assets:    
Beginning balance $ 2.0 $ 1.5
Purchases and sales net   (0.7)
Actual return on plan assets held (0.5) 1.4
Foreign currency changes 0.1 (0.2)
Ending balance $ 1.6 $ 2.0