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Employee benefits - Defined Benefit Obligation Sensitivity Analysis (Details) € in Millions	Dec. 31, 2019 EUR (€)
Discount rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Effect on the post-employment benefit obligation with a 1% increase	€ (51.4)
Effect on the post-employment benefit obligation with a 1% decrease	68.1
Actuarial assumption of expected rates of inflation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Effect on the post-employment benefit obligation with a 1% increase	43.5
Effect on the post-employment benefit obligation with a 1% decrease	(35.4)
Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Effect on the post-employment benefit obligation with a 1% increase	16.6
Effect on the post-employment benefit obligation with a 1% decrease	(12.3)
Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Effect on the post-employment benefit obligation with a 1% increase	44.9
Effect on the post-employment benefit obligation with a 1% decrease	€ (36.3)

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The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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