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Basis of Presentation and Accounting Policies (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2018
USD ($)
Apr. 30, 2018
EUR (€)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
EUR (€)
Sep. 30, 2018
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Net proceeds from sale of tax credits $ 234.5 € 190.9 $ 143.5 € 133.0  
Goodwill | Minimum          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Discount rates         10.60%
Goodwill | Maximum          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Discount rates         14.20%