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Contingencies - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2019
Sep. 30, 2018
Nov. 30, 2017
Commitments and Contingencies Disclosure [Abstract]      
Gain contingency, unrecorded amount     $ 84.3
Litigation settlement, interest rate     9.00%
Litigation settlement, expense     $ 7.2
Litigation settlement, amount awarded from other party   $ 141.7  
Proceeds from legal settlements $ 20.1 $ 35.7