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Acquisitions and Dispositions - Acquired Entities (Details) $ in Millions |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) employee | Jun. 14, 2019 | Jun. 12, 2019 | Jan. 04, 2019 USD ($) employee vehicle branch | Aug. 13, 2018 USD ($) employee vehicle branch | Sep. 30, 2019 USD ($) employee | Sep. 30, 2019 USD ($) employee acquisition | Dec. 31, 2018 USD ($)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Goodwill | $ 776.0 |  |  |  |  | $ 776.0 | $ 776.0 | $ 678.6
Other Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Entity number of employees | employee | 1,300 |  |  |  |  | 1,300 | 1,300 |
Number of Businesses Acquired | acquisition |  |  |  |  |  |  | 3 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Purchase consideration - cash paid |  |  |  |  |  |  | $ 53.4 |
Fair value of future payments to sellers | $ 7.8 |  |  |  |  | $ 7.8 | 7.8 |
Contingent consideration | 1.6 |  |  |  |  | 1.6 | 1.6 |
Indemnification asset | (6.5) |  |  |  |  | (6.5) | (6.5) |
Fair value of purchase consideration |  |  |  |  |  |  | 56.3 |
Cash | 5.1 |  |  |  |  | 5.1 | 5.1 |
Accounts receivable | 4.5 |  |  |  |  | 4.5 | 4.5 |
Property and equipment, net | 7.3 |  |  |  |  | 7.3 | 7.3 |
Intangible assets | 21.6 |  |  |  |  | 21.6 | 21.6 |
Goodwill | 36.5 |  |  |  |  | 36.5 | 36.5 |
Other noncurrent assets | 2.4 |  |  |  |  | 2.4 | 2.4 |
Current liabilities | (14.8) |  |  |  |  | (14.8) | (14.8) |
Noncurrent liabilities | (6.3) |  |  |  |  | (6.3) | (6.3) |
Fair value of net assets acquired | $ 56.3 |  |  |  |  | $ 56.3 | $ 56.3 |
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% |  |  |  |  | 100.00% | 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 |  |  |  | 9.2 |  |  |  |
Other current assets |  |  |  | 0.5 |  |  |  |
Property and equipment, net |  |  |  | 2.7 |  |  |  |
Intangible assets |  |  |  | 47.9 |  |  |  |
Goodwill |  |  |  | 84.3 |  |  |  |
Other noncurrent assets |  |  |  | 5.3 |  |  |  |
Current liabilities |  |  |  | (9.6) |  |  |  |
Noncurrent liabilities |  |  |  | (7.9) |  |  |  |
Fair value of net assets acquired |  |  |  | 133.8 |  |  |  |
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 assets decrease |  |  |  |  |  |  |  | 20.0
Goodwill increase |  |  |  |  |  |  |  | 21.0
Noncurrent assets increase |  |  |  |  |  |  |  | 11.0
Noncurrent liability increase |  |  |  |  |  |  |  | 16.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |
Purchase consideration - cash paid |  |  |  |  | $ 546.8 |  |  |
Receivable from seller |  |  |  |  |  | $ (6.3) |  | $ 6.0
Fair value of purchase consideration |  |  |  |  | 540.5 |  |  |
Cash |  |  |  |  | 25.8 |  |  |
Accounts receivable |  |  |  |  | 31.9 |  |  |
Other current assets |  |  |  |  | 11.7 |  |  |
Property and equipment, net |  |  |  |  | 56.6 |  |  |
Intangible assets |  |  |  |  | 162.0 |  |  |
Goodwill |  |  |  |  | 304.1 |  |  |
Other noncurrent assets |  |  |  |  | 21.1 |  |  |
Current liabilities |  |  |  |  | (29.5) |  |  |
Noncurrent liabilities |  |  |  |  | (43.2) |  |  |
Fair value of net assets acquired |  |  |  |  | 540.5 |  |  |
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 |  |  |  | 46.0 |  |  |  |
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 |  |  |  |  | 148.0 |  |  |
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 |  |  |  |
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 |  |  |  |  | $ 14.0 |  |  |
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 |  |  |  |

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