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Debt - Schedule of Notes Estimated Fair Value (Details) - Fair Value, Inputs, Level 2 - Senior Notes - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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2023 Senior Notes |  |
Debt Instrument [Line Items] |  |
Notes, fair value | $ 0.0 | $ 255.1
2026 Senior Notes |  |
Debt Instrument [Line Items] |  |
Notes, fair value | 0.0 | 625.4
2029 Senior Notes |  |
Debt Instrument [Line Items] |  |
Notes, fair value | 825.4 | 0.0
2031 Senior Notes |  |
Debt Instrument [Line Items] |  |
Notes, fair value | $ 803.0 | $ 0.0

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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=123874694&loc=d3e19207-110258 + Details
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