Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Short-term borrowings	$ 47.2	$ 9.8
Long-term Debt Types [Abstract]
Total long-term debt	3,355.6	2,956.9
Total Debt	3,402.8	2,966.7
Long Term Debt By Current And Noncurrent [Abstract]
Current liabilities	129.6	125.0
Noncurrent liabilities	3,273.2	2,841.7
Interest Rate And Other Disclosures [Abstract]
Long-term revolving credit facilities: Borrowings	7,058.7	3,385.5	$ 897.8
Long-term revolving credit facilities: Repayments	(6,832.7)	(2,836.8)	$ (1,008.9)
Brink's Capital credit facility
Interest Rate And Other Disclosures [Abstract]
Long-term revolving credit facilities: Borrowings	5,339.4
Long-term revolving credit facilities: Repayments	(5,290.1)
Term Loan A | Senior Secured Credit Facility - Amended III
Long-term Debt Types [Abstract]
Long-term Debt	$ 1,377.4
Interest Rate And Other Disclosures [Abstract]
Effective interest rate	5.70%
Debt issue cost	$ 5.1
Term Loan A | Senior Secured Credit Facility - Amended II
Long-term Debt Types [Abstract]
Long-term Debt		$ 1,224.7
Interest Rate And Other Disclosures [Abstract]
Effective interest rate		1.90%
Debt issue cost		$ 3.7
Senior unsecured notes | Six hundred million senior unsecured notes
Long-term Debt Types [Abstract]
Long-term Debt	$ 992.1	$ 989.8
Interest Rate And Other Disclosures [Abstract]
Effective interest rate	4.60%	4.60%
Debt issue cost	$ 7.9	$ 10.2
Senior unsecured notes | Four hundred million senior unsecured notes
Interest Rate And Other Disclosures [Abstract]
Effective interest rate	5.50%	5.50%
Revolving Credit Facility
Long-term Debt Types [Abstract]
Debt	$ 646.9	$ 495.0
Interest Rate And Other Disclosures [Abstract]
Average interest rate	5.50%	2.50%
Other Non-US Dollar-denominated Facilities
Long-term Debt Types [Abstract]
Debt	$ 147.0	$ 68.9
Interest Rate And Other Disclosures [Abstract]
Average interest rate	4.80%	1.60%
Other Non-US Dollar-denominated Facilities | Brink's Capital credit facility
Long-term Debt Types [Abstract]
Debt	$ 106.8	$ 57.5
Financing leases
Long-term Debt Types [Abstract]
Financing leases	$ 192.2	$ 178.5
Interest Rate And Other Disclosures [Abstract]
Average interest rate	5.50%	4.40%
Other
Debt Instrument [Line Items]
Short-term borrowings	$ 47.2	$ 9.8
Interest Rate And Other Disclosures [Abstract]
Short-term borrowings interest rate	4.30%	6.70%