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Debt - Schedule of Notes Estimated Fair Value (Details) - Significant Other Observable Inputs (Level 2) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
2023 Senior Notes |  |
Debt Instrument [Line Items] |  |
Notes, fair value | $ 255.1 | $ 464.2
2026 Senior Notes |  |
Debt Instrument [Line Items] |  |
Notes, fair value | $ 625.4 | $ 634.9

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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