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Acquisitions and Divestitures Definite-lived intangible assets acquired (Details) - USD ($) $ in Millions | Apr. 01, 2018 | Oct. 01, 2017
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 1,277.0 | $ 409.0
Accumulated amortization | 277.5 | 194.8
Net carrying amount | 999.5 | 214.2
Acquired and reacquired rights |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,174.5 | 328.8
Accumulated amortization | 232.1 | 154.2
Net carrying amount | $ 942.4 | $ 174.6

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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/presentationRef -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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