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Contingencies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]        
Accrual of loss contingency $ 38.0      
Estimate of possible loss 300.0      
Unrecognized tax benefits 108.0 $ 94.0 $ 71.0 $ 63.0
Shareholder Litigation        
Loss Contingencies [Line Items]        
Amount awarded to other party 4.9      
Legal Reserve | Invoicing Matter        
Loss Contingencies [Line Items]        
Estimate of possible loss $ 380.0