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Fair value of financial instruments (Details)
$ in Millions
3 Months Ended
Jul. 15, 2022
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Jul. 26, 2023
USD ($)
Jun. 30, 2023
derivative_instrument
Dec. 31, 2022
Instruments
Sep. 30, 2022
derivative_instrument
Jul. 21, 2022
USD ($)
Jul. 12, 2022
USD ($)
derivative_instrument
Mar. 31, 2022
derivative_instrument
Jun. 30, 2021
derivative_instrument
Mar. 31, 2019
derivative_instrument
Debt Securities, Available-for-sale [Line Items]                          
Other operating income (expense)   $ (12.6) $ 8.3                    
Foreign currency transaction gains   0.0 (9.8)                    
Interest expense   55.8 46.6                    
G4S                          
Debt Securities, Available-for-sale [Line Items]                          
Contingent consideration   22.0                      
Not Designated as Hedging Instrument | Foreign Exchange Contract                          
Debt Securities, Available-for-sale [Line Items]                          
Notional value of nonderivative instruments   $ 757.0                      
Weighted average maturity   1 month                      
Not Designated as Hedging Instrument | Foreign Exchange Contract | Other operating income (expense)                          
Debt Securities, Available-for-sale [Line Items]                          
Gain (loss) on foreign currency contract   $ 13.4 8.2                    
Designated as Hedging Instrument | Currency Swap                          
Debt Securities, Available-for-sale [Line Items]                          
Other operating income (expense)   0.0 3.4                    
Foreign currency transaction gains   0.0 3.4                    
Interest expense   0.0 0.3                    
Foreign currency derivative instrument losses   $ 0.0 (3.7)                    
Designated as Hedging Instrument | $400 million interest rate swap                          
Debt Securities, Available-for-sale [Line Items]                          
Number of instruments held | derivative_instrument                         10
Notional value of derivative instrument       $ 400.0                  
Designated as Hedging Instrument | $200 million interest rate swap                          
Debt Securities, Available-for-sale [Line Items]                          
Number of instruments held | derivative_instrument                     4    
Designated as Hedging Instrument | $200 million interest rate swap | Gains (losses) on cash flow hedges                          
Debt Securities, Available-for-sale [Line Items]                          
Cumulative net gain in AOCI     9.2                    
Designated as Hedging Instrument | $200 million interest rate swap amended                          
Debt Securities, Available-for-sale [Line Items]                          
Weighted average maturity   1 year 8 months 12 days                      
Number of instruments held | derivative_instrument               3          
Notional value of derivative instrument   $ 200.0                      
Designated as Hedging Instrument | $175 million interest rate swap                          
Debt Securities, Available-for-sale [Line Items]                          
Weighted average maturity   1 year 8 months 12 days                      
Number of instruments held | Instruments             2            
Notional value of derivative instrument   $ 175.0                      
Designated as Hedging Instrument | $400 million interest rate swap 2023                          
Debt Securities, Available-for-sale [Line Items]                          
Weighted average maturity   1 year 8 months 12 days                      
Number of instruments held | derivative_instrument           8              
Notional value of derivative instrument   $ 400.0                      
Designated as Hedging Instrument | $400 million cross currency swap                          
Debt Securities, Available-for-sale [Line Items]                          
Number of instruments held | derivative_instrument                       10  
Cash proceeds from settlement of cross currency swap $ 67.0                        
Designated as Hedging Instrument | $400 million cross currency swap 2022                          
Debt Securities, Available-for-sale [Line Items]                          
Number of instruments held | derivative_instrument                   9      
Notional value of derivative instrument   $ 400.0               $ 400.0      
Designated as Hedging Instrument | $215 million cross currency swap                          
Debt Securities, Available-for-sale [Line Items]                          
Notional value of derivative instrument                   215.0      
Designated as Hedging Instrument | $185 million cross currency swap                          
Debt Securities, Available-for-sale [Line Items]                          
Weighted average maturity   6 years 1 month 6 days                      
Notional value of derivative instrument                   $ 185.0      
Designated as Hedging Instrument | $215 million cross currency swap II                          
Debt Securities, Available-for-sale [Line Items]                          
Weighted average maturity   1 year 9 months 18 days                      
Notional value of derivative instrument         $ 215.0                
Designated as Hedging Instrument | $55 million foreign exchange forward swap                          
Debt Securities, Available-for-sale [Line Items]                          
Weighted average maturity   7 months 6 days                      
Notional value of derivative instrument   $ 55.0                      
Level 2 | Not Designated as Hedging Instrument | Foreign Exchange Contract                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of derivative instruments, net   6.0   (1.1)                  
Level 2 | Designated as Hedging Instrument                          
Debt Securities, Available-for-sale [Line Items]                          
Net derivative instrument gains included in interest expense   (6.1) (5.4)                    
Level 2 | Designated as Hedging Instrument | $400 million interest rate swap                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position       1.1                  
Net derivative instrument gains included in interest expense   (5.0) (4.0)                    
Level 2 | Designated as Hedging Instrument | $200 million interest rate swap amended                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   14.5   12.2         $ 9.2        
Level 2 | Designated as Hedging Instrument | $175 million interest rate swap                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   2.9                      
Fair value of swap, net       0.1                  
Level 2 | Designated as Hedging Instrument | $400 million interest rate swap 2023                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   12.4   5.7                  
Level 2 | Designated as Hedging Instrument | $400 million cross currency swap                          
Debt Securities, Available-for-sale [Line Items]                          
Net derivative instrument gains included in interest expense     $ (1.4)                    
Level 2 | Designated as Hedging Instrument | $400 million cross currency swap 2022                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of contract, liability position   29.1   34.6                  
Net derivative instrument gains included in interest expense   (1.1)                      
Level 2 | Prepaid expenses and other | Not Designated as Hedging Instrument | Foreign Exchange Contract                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of derivative instruments, asset   7.1   8.7                  
Level 2 | Prepaid expenses and other | Designated as Hedging Instrument | $200 million interest rate swap amended                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   6.3   5.8                  
Level 2 | Prepaid expenses and other | Designated as Hedging Instrument | $175 million interest rate swap                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   2.3   1.9                  
Level 2 | Prepaid expenses and other | Designated as Hedging Instrument | $400 million interest rate swap 2023                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   7.2   5.4                  
Level 2 | Prepaid expenses and other | Designated as Hedging Instrument | $400 million cross currency swap 2022                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of contract, liability position   5.6   5.6                  
Level 2 | Prepaid expenses and other | Designated as Hedging Instrument | $55 million foreign exchange forward swap                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of contract, asset position   0.2   0.1                  
Level 2 | Accrued liabilities | Not Designated as Hedging Instrument | Foreign Exchange Contract                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of derivative instruments, liability   1.1   9.8                  
Level 2 | Other assets | Designated as Hedging Instrument | $200 million interest rate swap amended                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   8.2   6.4                  
Level 2 | Other assets | Designated as Hedging Instrument | $175 million interest rate swap                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   0.6                      
Level 2 | Other assets | Designated as Hedging Instrument | $400 million interest rate swap 2023                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, asset position   5.2   0.3                  
Level 2 | Other assets | Designated as Hedging Instrument | $215 million cross currency swap II                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of contract, asset position   1.0   0.1                  
Level 2 | Other liabilities | Designated as Hedging Instrument | $175 million interest rate swap                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of swap, liability position       1.8                  
Level 2 | Other liabilities | Designated as Hedging Instrument | $400 million cross currency swap 2022                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value of contract, liability position   34.7   40.2                  
Six hundred million senior unsecured notes                          
Debt Securities, Available-for-sale [Line Items]                          
Carrying value   600.0   600.0                  
Six hundred million senior unsecured notes | Level 3                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value   552.6   554.6                  
Four hundred million senior unsecured notes                          
Debt Securities, Available-for-sale [Line Items]                          
Carrying value   400.0   400.0                  
Four hundred million senior unsecured notes | Level 3                          
Debt Securities, Available-for-sale [Line Items]                          
Fair value   $ 386.2   $ 382.0