Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Short-term borrowings	$ 94.1		$ 47.2
Long-term Debt Types [Abstract]
Total long-term debt	3,276.8		3,355.6
Total Debt	3,370.9		3,402.8
Long-term Debt by Current and Noncurrent [Abstract]
Current liabilities	180.7		129.6
Noncurrent liabilities	3,190.2		3,273.2
Other Disclosures [Abstract]
Long-term revolving credit facilities: Borrowings	1,961.1	$ 1,288.7
Long-term revolving credit facilities: Repayments	(2,044.1)	$ (1,153.0)
Brink's Capital credit facility
Other Disclosures [Abstract]
Long-term revolving credit facilities: Borrowings	1,547.3
Long-term revolving credit facilities: Repayments	(1,579.9)
Term Loan A | Senior Secured Credit Facility - Amended III
Long-term Debt Types [Abstract]
Long-term Debt	1,368.9		1,377.4
Other Disclosures [Abstract]
Debt issue costs	4.8		5.1
Senior unsecured notes | Six hundred million senior unsecured notes
Long-term Debt Types [Abstract]
Long-term Debt	992.7		992.1
Other Disclosures [Abstract]
Debt issue costs	7.3		7.9
Revolving Credit Facility
Long-term Debt Types [Abstract]
Debt	602.1		646.9
Other Non-US Dollar-denominated Facilities
Long-term Debt Types [Abstract]
Debt	99.2		147.0
Other Non-US Dollar-denominated Facilities | Brink's Capital credit facility
Long-term Debt Types [Abstract]
Debt	74.2		106.8
Financing leases
Long-term Debt Types [Abstract]
Financing leases	213.9		192.2
Short-term borrowings
Debt Instrument [Line Items]
Short-term borrowings	$ 94.1		$ 47.2