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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

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