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Non-current and current financial debts - Maturity of borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Financial debts $ 3,479.0 $ 47.0
Nominal amount - Current and non-current financial debt [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 3,463.0  
Derivatives [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 16.0  
Gross carrying amount [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 3,508.0  
Gross carrying amount [member] | Not later than one year [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 261.0  
Gross carrying amount [member] | Between one and five years [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 1,247.0  
Gross carrying amount [member] | Later than five years [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 2,000.0  
Gross carrying amount [member] | Nominal amount - Current and non-current financial debt [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 3,492.0  
Gross carrying amount [member] | Nominal amount - Current and non-current financial debt [member] | Not later than one year [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 245.0  
Gross carrying amount [member] | Nominal amount - Current and non-current financial debt [member] | Between one and five years [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 1,247.0  
Gross carrying amount [member] | Nominal amount - Current and non-current financial debt [member] | Later than five years [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 2,000.0  
Gross carrying amount [member] | Derivatives [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 16.0  
Gross carrying amount [member] | Derivatives [member] | Not later than one year [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 16.0  
Gross carrying amount [member] | Derivatives [member] | Between one and five years [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 0.0  
Gross carrying amount [member] | Derivatives [member] | Later than five years [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 0.0  
Unamortized debt discount and issuance costs [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 29.0  
Unamortized debt discount and issuance costs [member] | Nominal amount - Current and non-current financial debt [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts 29.0  
Unamortized debt discount and issuance costs [member] | Derivatives [member]    
Disclosure of detailed information about borrowings [line items]    
Financial debts $ 0.0