Derivative Instruments and Hedging Activities (Narrative) (Details) € in Millions, $ in Millions	Sep. 30, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Jan. 31, 2018 USD ($)	Jan. 31, 2018 EUR (€)
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 2,991.8
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	196.3		$ 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	287.4					€ 245.7
Designated as Hedging Instrument | Net Investment Hedging | Credit facility, expires 2023
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount | €		€ 110.0		€ 190.0
Not Designated as Hedging Instrument | Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 2,795.5		$ 2,800.3