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Acquisitions and Dispositions - Acquired Entities (Details) $ in Millions |  |  |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2020 | Mar. 09, 2020 USD ($) | Sep. 30, 2019 | Jun. 14, 2019 | Jun. 12, 2019 | Jan. 04, 2019 USD ($) employee vehicle branch | Jun. 30, 2020 USD ($) employee acquisition | Dec. 31, 2019 USD ($)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  | $ 171.5 | $ 158.0
Right-of-use assets, net |  |  |  |  |  |  | 329.8 | 270.3
Goodwill |  |  |  |  |  |  | 1,114.0 | $ 784.6
Fair value of noncontrolling interest |  |  |  |  |  |  | $ (67.8) |
G4Si |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition date |  | Mar. 09, 2020 |  |  |  |  |  |
Percentage of shares acquired |  | 100.00% |  |  |  |  |  |
G4S |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition date | Apr. 01, 2020 |  |  |  |  |  |  |
Percentage of shares acquired |  |  |  |  |  |  | 100.00% |
Percentage of total purchase price |  |  |  |  |  |  | 80.00% |
Annual revenues |  | $ 690.0 |  |  |  |  |  |
Goodwill not allocated |  |  |  |  |  |  | $ 12.0 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Purchase consideration - cash paid |  |  |  |  |  |  | 651.2 |
Contingent consideration |  |  |  |  |  |  | 38.0 |
Liabilities assumed from seller |  |  |  |  |  |  | 9.4 |
Receivable from seller |  |  |  |  |  |  | (3.9) |
Fair value of purchase consideration |  | $ 694.7 |  |  |  |  | 694.7 |
Cash |  |  |  |  |  |  | 214.3 |
Restricted cash |  |  |  |  |  |  | 30.1 |
Accounts receivable |  |  |  |  |  |  | 129.5 |
Other current assets |  |  |  |  |  |  | 22.6 |
Property and equipment, net |  |  |  |  |  |  | 123.1 |
Right-of-use assets, net |  |  |  |  |  |  | 72.0 |
Intangible assets |  |  |  |  |  |  | 157.7 |
Goodwill |  |  |  |  |  |  | 370.3 |
Other noncurrent assets |  |  |  |  |  |  | 19.3 |
Current liabilities |  |  |  |  |  |  | (229.8) |
Lease liabilities |  |  |  |  |  |  | (58.2) |
Noncurrent liabilities |  |  |  |  |  |  | (88.4) |
Fair value of net assets acquired |  |  |  |  |  |  | $ 762.5 |
G4S Tranche III |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of shares acquired |  |  |  |  |  |  | 100.00% |
Rodoban |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  | Jan. 04, 2019 |  |
Percentage of shares acquired |  |  |  |  |  | 100.00% |  |
Annual revenues |  |  |  |  |  | $ 80.0 |  |
Entity number of employees | employee |  |  |  |  |  | 2,900 |  |
Entity Number of branches | branch |  |  |  |  |  | 13 |  |
Entity Number of armored vehicles | vehicle |  |  |  |  |  | 190 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Purchase consideration - cash paid |  |  |  |  |  | $ 135.7 |  |
Indemnification asset |  |  |  |  |  | (1.9) |  |
Fair value of purchase consideration |  |  |  |  |  | 133.8 |  |
Cash |  |  |  |  |  | 1.4 |  |
Accounts receivable |  |  |  |  |  | 8.9 |  |
Other current assets |  |  |  |  |  | 0.5 |  |
Property and equipment, net |  |  |  |  |  | 2.4 |  |
Intangible assets |  |  |  |  |  | 49.0 |  |
Goodwill |  |  |  |  |  | 85.1 |  |
Other noncurrent assets |  |  |  |  |  | 5.8 |  |
Current liabilities |  |  |  |  |  | (11.4) |  |
Noncurrent liabilities |  |  |  |  |  | (7.9) |  |
Fair value of net assets acquired |  |  |  |  |  | 133.8 |  |
Other Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Entity number of employees | employee |  |  |  |  |  |  | 1,300 |
Number of Businesses Acquired | acquisition |  |  |  |  |  |  | 3 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Purchase consideration - cash paid |  |  |  |  |  |  | $ 60.2 |
Contingent consideration |  |  |  |  |  |  | 1.6 |
Indemnification asset |  |  |  |  |  |  | (12.9) |
Fair value of purchase consideration |  |  |  |  |  |  | 48.9 |
Cash |  |  |  |  |  |  | 6.5 |
Accounts receivable |  |  |  |  |  |  | 4.5 |
Property and equipment, net |  |  |  |  |  |  | 7.1 |
Intangible assets |  |  |  |  |  |  | 24.4 |
Goodwill |  |  |  |  |  |  | 33.8 |
Other noncurrent assets |  |  |  |  |  |  | 1.9 |
Current liabilities |  |  |  |  |  |  | (15.2) |
Noncurrent liabilities |  |  |  |  |  |  | (14.1) |
Fair value of net assets acquired |  |  |  |  |  |  | $ 48.9 |
BI |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  | Jun. 12, 2019 |  |  |
Percentage of shares acquired |  |  |  |  | 100.00% |  |  |
COMEF |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition date |  |  |  | Jun. 14, 2019 |  |  |  |
Percentage of shares acquired |  |  |  | 100.00% |  |  |  |
TVS |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition date |  |  | Sep. 30, 2019 |  |  |  |  |
Percentage of shares acquired |  |  |  |  |  |  | 100.00% |
Customer relationships | G4S |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Remaining Amortization Period |  |  |  |  |  |  | 15 years |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 158.0 |
Customer relationships | Rodoban |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Remaining Amortization Period |  |  |  |  |  |  | 11 years |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 47.0 |  |
Trade names | Rodoban |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Remaining Amortization Period |  |  |  |  |  |  | 1 year |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 1.0 |  |
Noncompete agreements | Rodoban |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Remaining Amortization Period |  |  |  |  |  |  | 5 years |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 1.0 |  |
EMEA | G4S |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 257.0 |
Asia Pacific | G4S |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 97.0 |
South America | G4S |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 5.0 |

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