Acquisitions and Dispositions Acquisitions and Dispositions - Acquired Entities (Details)										12 Months Ended
	Dec. 04, 2018	Nov. 01, 2018	Aug. 13, 2018 USD ($) employee vehicle branch	Oct. 31, 2017	Aug. 14, 2017	Jul. 18, 2017 USD ($) employee vehicle branch	Jun. 29, 2017	Apr. 19, 2017	Mar. 14, 2017	Dec. 31, 2018 USD ($) employee acquisition	Dec. 31, 2017 USD ($) acquisition	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Number of acquired operations | acquisition											6
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Indemnification asset										$ (6,600,000)
Fair value of purchase consideration and noncontrolling interests										157,500,000
Goodwill										$ 678,600,000	$ 453,700,000	$ 186,200,000
Other Acquisitions
Business Acquisition [Line Items]
Number of acquired operations | acquisition										6
Entity Number of Employees | employee										1,800
Intangible asset decrease										$ 10,000,000
Goodwill increase										9,000,000
Noncurrent liability increase										12,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Purchase consideration - cash paid										162,500,000
Indemnification asset										(9,800,000)
Fair value of future payments to sellers										3,700,000
Fair value of purchase consideration										156,400,000
Fair value of noncontrolling interests										1,100,000
Cash										7,600,000
Accounts receivables										20,300,000
Property and Equipment, net										14,100,000
Intangible assets										41,600,000
Goodwill										115,800,000
Other noncurrent assets										7,400,000
Current liabilities										(23,700,000)
Noncurrent liabilities										(25,600,000)
Fair value of net assets acquired										157,500,000
AATI
Business Acquisition [Line Items]
Acquisition date									Mar. 14, 2017
Percentage of shares acquired									100.00%
Pag Facil
Business Acquisition [Line Items]
Acquisition date								Apr. 19, 2017
Percentage of shares acquired								100.00%
LGS
Business Acquisition [Line Items]
Acquisition date							Jun. 29, 2017
Percentage of shares acquired							100.00%
Maco Litoral
Business Acquisition [Line Items]
Acquisition date					Aug. 14, 2017
Percentage of shares acquired					100.00%
Temis
Business Acquisition [Line Items]
Acquisition date				Oct. 31, 2017
Percentage of shares acquired				100.00%
Worldbridge
Business Acquisition [Line Items]
Acquisition date	Dec. 04, 2018
Percentage of shares acquired	60.00%
Dunbar
Business Acquisition [Line Items]
Acquisition date			Aug. 13, 2018
Percentage of shares acquired			100.00%
Entity Number of Employees | employee			5,400
Entity Number Of Branches | branch			78
Entity Number Of Armored Vehicles | vehicle			1,600
Intangible asset decrease										20,000,000
Goodwill increase										24,000,000
Noncurrent assets increase										11,000,000
Noncurrent liability increase										$ 13,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Purchase consideration - cash paid			$ 546,800,000
Fair value of purchase consideration			546,800,000
Cash			25,800,000
Accounts receivables			31,900,000
Other current assets			11,700,000
Property and Equipment, net			57,000,000
Intangible assets			162,000,000
Goodwill			307,100,000
Other noncurrent assets			21,100,000
Current liabilities			(29,700,000)
Noncurrent liabilities			(40,100,000)
Fair value of net assets acquired			546,800,000
Maco
Business Acquisition [Line Items]
Acquisition date						Jul. 18, 2017
Percentage of shares acquired						100.00%
Entity Number of Employees | employee						1,450
Entity Number Of Branches | branch						4
Entity Number Of Armored Vehicles | vehicle						150
Potential undiscounted amount minimum						$ 0
Potential undiscounted amount maximum						30,300,000.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Purchase consideration - cash paid						189,600,000
Indemnification asset						(300,000)
Fair value of future payments to sellers						1,500,000
Contingent consideration						15,100,000
Fair value of purchase consideration						205,900,000
Cash						10,300,000
Accounts receivables						16,600,000
Other current assets						600,000
Property and Equipment, net						2,400,000
Intangible assets						60,200,000
Goodwill						148,800,000
Other noncurrent assets						100,000
Current liabilities						(11,800,000)
Noncurrent liabilities						(21,300,000)
Fair value of net assets acquired						$ 205,900,000
Brink's de Colombia SA
Business Acquisition [Line Items]
Acquisition date		Nov. 01, 2018
Percentage of shares acquired		42.00%
Ownership percentage after remaining noncontrolling interest acquired										100.00%
Measurement Input, Revenue Multiple | Maco
Business Acquisition [Line Items]
Revenue Multiple						2.5
Customer relationships | Dunbar
Business Acquisition [Line Items]
Remaining Amortization Period										15 years
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets			148,000,000
Finite-lived trade names | Dunbar
Business Acquisition [Line Items]
Remaining Amortization Period										8 years
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets			$ 14,000,000