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Financial instruments and fair value measurements - debt instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Gross amount $ 5,580.0 $ 6,349.1
Fair value 5,429.9 5,998.6
Secured Debt    
Debt Instrument [Line Items]    
Gross amount 221.0 327.2
Fair value 221.0 327.2
Senior secured credit facilities: | Medium-term Notes, 2.50% | Euro    
Debt Instrument [Line Items]    
Gross amount 630.1 636.7
Fair value 630.9 627.5
Senior secured credit facilities: | Medium-term Notes, 2.50% | U.S. dollars    
Debt Instrument [Line Items]    
Gross amount 787.6 1,488.3
Fair value 791.0 1,485.5
Senior secured credit facilities: | Medium-term Notes, 2.00% | Euro    
Debt Instrument [Line Items]    
Gross amount 350.4 342.0
Fair value 351.1 340.7
Notes | 2.625% secured notes    
Debt Instrument [Line Items]    
Gross amount 718.7 694.5
Fair value 705.3 658.5
Notes | 3.875% unsecured notes    
Debt Instrument [Line Items]    
Gross amount 800.0 800.0
Fair value 727.3 672.0
Notes | 3.875% unsecured notes 2    
Debt Instrument [Line Items]    
Gross amount 442.3 427.3
Fair value 434.3 396.5
Notes | 4.625 % unsecured notes    
Debt Instrument [Line Items]    
Gross amount 1,550.0 1,550.0
Fair value 1,489.1 1,407.6
Finance lease liabilities    
Debt Instrument [Line Items]    
Gross amount 68.3 68.9
Fair value 68.3 68.9
Other    
Debt Instrument [Line Items]    
Gross amount 11.6 14.2
Fair value $ 11.6 $ 14.2