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Other Assets and Liabilities - Other Current Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Other Assets and Liabilities [Abstract]    
Income and other tax receivable $ 158.7 $ 142.0
Short-term derivative assets (see Note 9) 150.6 72.9
Prepaid expenses 29.4 21.8
Other 19.5 19.7
Total $ 358.2 $ 256.4