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Liquidity - Commercial Paper (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]      
Commercial paper, outstanding € 1,099.5    
Interest rate 1.09% 1.33% 1.29%
Carrying amount of commercial paper € 1,100.5    
Commercial Papers      
Disclosure of financial liabilities [line items]      
Weighted average interest rate (0.38%)    
Commercial Papers | Highest      
Disclosure of financial liabilities [line items]      
Maturities 6 months