Derivative Instruments - Derivative Narrative (Details) - Designated as Hedging Instrument [Member] - Cross Currency Interest Rate Contract [Member] - Net Investment Hedging [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Maximum Remaining Maturity of Foreign Currency Derivatives		5 years	5 years
Derivative, Fixed Interest Rate		2.90%	2.10%
Derivative, Cash Received on Hedge	$ 1.1
Maximum [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 125.0	$ 150.0
Minimum [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 75.0	$ 75.0