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Non-current and current financial debts - Maturity of borrowings (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 09, 2019
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Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | $ 4,118.0 | $ 3,479.0 | $ 3,500.0
Nominal amount - Current and non-current financial debt [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 4,111.0 | 3,463.0 |
Derivatives [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 7.0 | 16.0 |
Gross carrying amount [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 4,150.0 | 3,508.0 |
Gross carrying amount [member] | Not later than one year [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 169.0 | 261.0 |
Gross carrying amount [member] | Between one and five years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 1,231.0 | 1,247.0 |
Gross carrying amount [member] | Later than five years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 2,750.0 | 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 | 4,143.0 | 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 | 162.0 | 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 | 1,231.0 | 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 | 2,750.0 | 2,000.0 |
Gross carrying amount [member] | Derivatives [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 7.0 | 16.0 |
Gross carrying amount [member] | Derivatives [member] | Not later than one year [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 7.0 | 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 | 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 | 0.0 |
Unamortized debt discount and issuance costs [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | 32.0 | 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 | 32.0 | 29.0 |
Unamortized debt discount and issuance costs [member] | Derivatives [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Financial debts | $ 0.0 | $ 0.0 |

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