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Non-current and current financial debts - Schedule of financial debts (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] |  |  |
Non-current financial debts | $ 3,949.0 | $ 3,218.0 |
Current financial debts | 169.0 | 261.0 |
Total financial debts | 4,118.0 | 3,479.0 | $ 3,500.0
Facility B [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current financial debts | 794.0 | 793.0 |
Facility C [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current financial debts | 429.0 | 391.0 |
Local facilities, Japan [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current financial debts | 0.0 | 55.0 |
Current financial debts | 101.0 | 115.0 |
Senior notes due 2026 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current financial debts | 496.0 | 495.0 |
Senior notes due 2029 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current financial debts | 992.0 | 991.0 |
Senior notes due 2030 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current financial debts | 744.0 | 0.0 |
Senior notes due 2049 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current financial debts | 494.0 | 493.0 |
Revolving facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current financial debts | 0.0 | 0.0 |
Local facilities, other [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current financial debts | 49.0 | 101.0 |
Other short-term financial debts [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current financial debts | 12.0 | 29.0 |
Derivatives [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current financial debts | 7.0 | 16.0 |
Total financial debts | $ 7.0 | $ 16.0 |

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- Definition The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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