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Derivative Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Designated as Hedging Instrument - Derivatives in Net Investment Hedging Relationship - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Assets | $ 3.5 | $ 38.9
Liabilities | (4.2) | (32.0)
Forward contracts |  |
Derivative [Line Items] |  |
Assets | 3.5 | 23.8
Liabilities | (2.3) | (1.0)
Put options |  |
Derivative [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | 0.0 | (31.0)
Call options |  |
Derivative [Line Items] |  |
Assets | 0.0 | 15.1
Liabilities | 0.0 | 0.0
Interest rate swap |  |
Derivative [Line Items] |  |
Assets | 0.0 | 0.0
Liabilities | $ (1.9) | $ 0.0

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