Financial Instruments and Fair Value Measurement - Interest Rate Risk (Details)	Jun. 30, 2020 USD ($)
Interest Swap Position One
Derivative [Line Items]
Notional amount	$ 150,000,000.0
Weighted Average Interest Rate	2.36%
Interest Swap Position Two
Derivative [Line Items]
Notional amount	$ 120,000,000.0
Weighted Average Interest Rate	2.92%
Interest Swap Position Three
Derivative [Line Items]
Notional amount	$ 80,000,000.0
Weighted Average Interest Rate	2.79%