Derivative Instruments and Hedging Activities (Narrative) (Details) € in Millions, $ in Millions	Jun. 30, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)	Jan. 31, 2018 USD ($)	Jan. 31, 2018 EUR (€)
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 2,677.7
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	125.3		$ 332.7
Designated as Hedging Instrument | Net Investment Hedging | Cross currency swap contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	300.0		300.0			$ 300.0
Designated as Hedging Instrument | Net Investment Hedging | Cross Currency Interest Rate Contract, Payment
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	275.4						€ 245.7
Designated as Hedging Instrument | Net Investment Hedging | Credit facility, expires 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount		€ 110.0		$ 182.1	€ 160.0
Not Designated as Hedging Instrument | Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 2,552.4		$ 2,800.3