Indebtedness (Debt Terms) (Details) - Term Loan Facility [Member]	Mar. 31, 2017 USD ($)	Oct. 31, 2016 EUR (€)
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,700,000.0	€ 375,000,000
Term Loan, Floating Rate Due October 19, 2019 0.75% [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, percent		0.75%
Debt instrument, face amount		€ 1,000,000.0
Term Loan, Fixed Rate Due October 19, 2019 0.75% [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, percent		0.75%
Debt instrument, face amount		€ 55,000,000
Term Loan, Floating Rate Due October 19, 2021 1.00% [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, percent		1.00%
Debt instrument, face amount		€ 25,500,000.0
Term Loan, Fixed Rate Due October 19, 2021 1.00% [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, percent		1.00%
Debt instrument, face amount		€ 166,500,000.0
Term Loan, Floating Rate Due October 19, 2023 1.25% [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, percent		1.25%
Debt instrument, face amount		€ 1,000,000.0
Term Loan, Fixed Rate Due October 19, 2023 1.33% [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, percent		1.33%
Debt instrument, face amount		€ 73,500,000.0
Term Loan, Fixed Rate Due October 19, 2026 1.98% [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, percent		1.98%
Debt instrument, face amount		€ 52,500,000.0