Derivative Instruments - Notional Amount (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Notional amount	$ 946.9	$ 656.4
Designated as hedge
Derivatives, Fair Value [Line Items]
Notional amount	784.0	497.7
Non-designated derivatives
Derivatives, Fair Value [Line Items]
Notional amount	162.9	158.7
Foreign exchange contracts | Cash flow hedges | Designated as hedge
Derivatives, Fair Value [Line Items]
Notional amount	484.0	497.7
Interest Rate Swap | Fair Value Hedging | Designated as hedge
Derivatives, Fair Value [Line Items]
Notional amount	$ 300.0	$ 0.0