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Conversion from IFRS to U.S. GAAP (Details)
$ in Millions
Jun. 30, 2018
USD ($)
Embedded Derivative Financial Instruments  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Derivative liability $ 177.9
Exchangeable Senior Notes Maturing May 1 2023 | Senior Notes  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Aggregate principal amount $ 1,000.0