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Basis of Preparation (Tables) | 9 Months Ended
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Sep. 30, 2021
Accounting Policies [Abstract] |
Schedule of Impact on Financial Statements | The following table summarizes the cumulative effect of the changes to our condensed consolidated balance sheet as of December 31, 2020 from the adoption of ASU 2020-06:
| Balance at December 31, 2020 |  | Adjustments due to ASU 2020-06 adoption |  | Balance at January 1, 2021
Liabilities |  |  |  |  |
Accrued income taxes | $ | 46.5 |  |  | $ | (0.2) |  |  | $ | 46.3 |
Current convertible notes (1) | 220.9 |  |  | 34.0 |  |  | 254.9 |
Long-term deferred tax liabilities | 60.2 |  |  | (7.6) |  |  | 52.6 |
Equity |  |  |  |  |
Additional paid-in-capital | $ | 780.8 |  |  | $ | (36.9) |  |  | $ | 743.9 |
Retained earnings | 808.4 |  |  | 10.7 |  |  | 819.1 |
_______________ (1)Current convertible notes is presented net of unamortized discount and debt issuance costs of $34.8 and $3.1, respectively at December 31, 2020. Current convertible notes is presented net of unamortized debt issuance costs of $3.9 at January 1, 2021.

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124437754&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124437754&loc=d3e725-108305 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794 + Details
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