Commitments and Contingencies (Loss Contingencies) (Details) $ in Millions	Jun. 30, 2019 USD ($)
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 50.2
Total liquidated damages
Loss Contingencies [Line Items]
Estimated Litigation Liability	46.0
Other costs associated with the settlement
Loss Contingencies [Line Items]
Estimated Litigation Liability	4.2
Liquidated damages for contract years ending July 31, 2018 and July 31, 2019
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 14.2