Debt (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Short-term borrowings	$ 127.5		$ 47.2
Long-term Debt Types [Abstract]
Total long-term debt	3,341.1		3,355.6
Total Debt	3,468.6		3,402.8
Long-term Debt by Current and Noncurrent [Abstract]
Current liabilities	217.4		129.6
Noncurrent liabilities	3,251.2		3,273.2
Other Disclosures [Abstract]
Long-term revolving credit facilities: Borrowings	4,256.4	$ 3,039.0
Long-term revolving credit facilities: Repayments	4,299.0	$ 3,039.3
Brink's Capital credit facility
Other Disclosures [Abstract]
Long-term revolving credit facilities: Borrowings	3,241.8
Long-term revolving credit facilities: Repayments	3,249.3
Term Loan A | Senior Secured Credit Facility - Amended III
Long-term Debt Types [Abstract]
Long-term Debt	1,360.5		1,377.4
Other Disclosures [Abstract]
Debt issue costs	4.5		5.1
Senior unsecured notes | Six hundred million senior unsecured notes
Long-term Debt Types [Abstract]
Long-term Debt	993.2		992.1
Other Disclosures [Abstract]
Debt issue costs	6.8		7.9
Revolving Credit Facility
Long-term Debt Types [Abstract]
Debt	620.5		646.9
Other Non-US Dollar-denominated Facilities
Long-term Debt Types [Abstract]
Debt	151.6		147.0
Other Non-US Dollar-denominated Facilities | Brink's Capital credit facility
Long-term Debt Types [Abstract]
Debt	99.4		106.8
Financing leases
Long-term Debt Types [Abstract]
Financing leases	215.3		192.2
Short-term borrowings
Debt Instrument [Line Items]
Short-term borrowings	$ 127.5		$ 47.2