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Contingencies - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Jun. 30, 2019
Jan. 31, 2017
Sep. 30, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]        
Accrual of loss contingency     $ 7.0  
Estimate of possible loss     300.0  
Unrecognized tax benefits     101.0 $ 108.0
Payments for settlements $ 48.8      
Invoicing Matter        
Loss Contingencies [Line Items]        
Amount awarded to other party $ 5.5 $ 40.0    
Legal Reserve | Invoicing Matter        
Loss Contingencies [Line Items]        
Estimate of possible loss     $ 380.0