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Business Combinations - Contingent Consideration Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Contingent Consideration |  |  |  |
Balance at December 31, 2022 |  |  | $ 17.3 |
(Decrease) increase in fair value of contingent consideration liabilities |  |  | (6.5) |
Acquired contingent consideration liabilities |  |  | 2.9 |
Payment of contingent consideration |  |  | (1.7) |
Balance at June 30, 2023 | $ 12.0 |  | 12.0 |
SES |  |  |  |
Contingent Consideration |  |  |  |
Balance at December 31, 2022 |  |  | 16.3 |
(Decrease) increase in fair value of contingent consideration liabilities | 0.4 | $ (0.3) | (7.0) | $ (0.8)
Acquired contingent consideration liabilities |  |  | 0.0 |
Payment of contingent consideration |  |  | 0.0 |
Balance at June 30, 2023 | 9.3 |  | 9.3 |
BIG |  |  |  |
Contingent Consideration |  |  |  |
Balance at December 31, 2022 |  |  | 1.0 |
(Decrease) increase in fair value of contingent consideration liabilities | (0.7) | $ 0.1 | 0.7 | $ (0.2)
Acquired contingent consideration liabilities |  |  | 0.0 |
Payment of contingent consideration |  |  | (1.7) |
Balance at June 30, 2023 | 0.0 |  | 0.0 |
MP |  |  |  |
Contingent Consideration |  |  |  |
Balance at December 31, 2022 |  |  | 0.0 |
(Decrease) increase in fair value of contingent consideration liabilities |  |  | (0.2) |
Acquired contingent consideration liabilities |  |  | 2.9 |
Payment of contingent consideration |  |  | 0.0 |
Balance at June 30, 2023 | $ 2.7 |  | $ 2.7 |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479581/805-30-50-4 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479581/805-30-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479668/805-30-25-6 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Subparagraph (b) -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479613/805-30-35-1 + Details
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