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Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Gross carrying amount | $ 4,217.6 | $ 4,194.4
Accumulated amortization | (3,645.5) | (3,163.2)
Net carrying amount | 572.1 | 1,031.2
Customer relationships |  |
Gross carrying amount | 3,653.9 | 3,673.1
Accumulated amortization | (3,363.6) | (2,914.2)
Net carrying amount | 290.3 | 758.9
Other |  |
Gross carrying amount | 563.7 | 521.3
Accumulated amortization | (281.9) | (249.0)
Net carrying amount | $ 281.8 | $ 272.3
Minimum | Customer relationships |  |
Estimated useful life at December 31, 2019 | 5 years |
Minimum | Other |  |
Estimated useful life at December 31, 2019 | 2 years |
Maximum | Customer relationships |  |
Estimated useful life at December 31, 2019 | 10 years |
Maximum | Other |  |
Estimated useful life at December 31, 2019 | 15 years |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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