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Convertible Securities (Details) - Junior Convertible Trust Preferred Securities
Aug. 10, 2018
USD ($)
$ / shares
Aug. 09, 2018
Sep. 30, 2018
Debt Instrument, Redemption [Line Items]      
Stated interest rate     5.15%
Conversion ratio per share of common stock 0.2525 0.2500  
Face amount of convertible security | $ $ 50.00    
Adjusted conversion price (in dollars per share) | $ / shares $ 198.02