Quarterly report pursuant to Section 13 or 15(d)

Commitments, Contingencies and Other Liabilities - Narrative (Details)

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Commitments, Contingencies and Other Liabilities - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Loss Contingencies [Line Items]          
Legal settlement reserve         $ 28.0
Damages paid     $ 23.0 $ 5.0  
Settled Litigation          
Loss Contingencies [Line Items]          
Proceeds from legal settlements $ 4.8 $ 12.5