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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
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

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