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Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 1,425.4 | $ 1,477.8
Accumulated Amortization | (676.0) | (689.9)
Net Book Value | 749.4 | 787.9
Customer relationships |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 972.4 | 984.3
Accumulated Amortization | (448.4) | (435.4)
Net Book Value | 524.0 | 548.9
Developed technology |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 362.7 | 400.0
Accumulated Amortization | (215.4) | (241.5)
Net Book Value | 147.3 | 158.5
Tradenames |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 90.3 | 91.8
Accumulated Amortization | (12.2) | (11.3)
Net Book Value | 78.1 | 80.5
Other |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 0.0 | 1.7
Accumulated Amortization | 0.0 | (1.7)
Net Book Value | $ 0.0 | $ 0.0

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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