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Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2021 | Dec. 31, 2020
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 130.3 | $ 113.0
Accumulated Amortization | (37.2) | (31.9)
Net Carrying Value | 93.1 | 81.1
Indefinite-lived intangible assets | 83.0 | 72.4
Total intangible assets, gross carrying value | 213.3 | 185.4
Total intangible assets, net | $ 176.1 | 153.5
Finite-lived intangible asset, useful life | 12 years |
Trade names |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | $ 83.0 | 72.4
Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 125.5 | 108.6
Accumulated Amortization | (34.6) | (29.6)
Net Carrying Value | $ 90.9 | 79.0
Finite-lived intangible asset, useful life | 12 years |
Other |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 4.8 | 4.4
Accumulated Amortization | (2.6) | (2.3)
Net Carrying Value | $ 2.2 | $ 2.1
Finite-lived intangible asset, useful life | 7 years |

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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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