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Indebtedness (Debt Terms) (Details) - Credit facility, expires 2020 - EUR (€)
Dec. 31, 2016
Oct. 31, 2016
Debt Instrument [Line Items]    
Debt, face amount € 395,600,000 € 375,000,000
Term Loan, Floating Rate Due October 19, 2019 0.75%    
Debt Instrument [Line Items]    
Debt, face amount   € 1,000,000.0
Debt Interest Rate   0.75%
Term Loan, Fixed Rate Due October 19, 2019 0.75%    
Debt Instrument [Line Items]    
Debt, face amount   € 55,000,000
Debt Interest Rate   0.75%
Term Loan, Floating Rate Due October 19, 2021 1.00%    
Debt Instrument [Line Items]    
Debt, face amount   € 25,500,000.0
Debt Interest Rate   1.00%
Term Loan, Fixed Rate Due October 19, 2021 1.00%    
Debt Instrument [Line Items]    
Debt, face amount   € 166,500,000.0
Debt Interest Rate   1.00%
Term Loan, Floating Rate Due October 19, 2023 1.25%    
Debt Instrument [Line Items]    
Debt, face amount   € 1,000,000.0
Debt Interest Rate   1.25%
Term Loan, Fixed Rate Due October 29, 2023 1.33%    
Debt Instrument [Line Items]    
Debt, face amount   € 73,500,000.0
Debt Interest Rate   1.33%
Term Loan, Fixed Rate Due October 29, 2026 1.98%    
Debt Instrument [Line Items]    
Debt, face amount   € 52,500,000.0
Debt Interest Rate   1.98%