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Borrowings Convertible Debt (Details) - Convertible Debt - Convertible Notes Due Twenty Twenty One $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | May 04, 2016 USD ($) $ / shares
Schedule of Convertible Debt |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.25%
Debt Instrument, Convertible, Conversion Ratio |  |  |  | 54.2741 |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares | $ 18.4250 |  |  | $ 18.4250 |  |  |
Debt Issuance Costs, Net | $ 5.0 |  |  | $ 5.0 |  |  |
Debt Issuance Costs Attributable to the Equity Component |  |  |  | 1.3 |  |  |
Debt Instrument, Face Amount | 172.5 |  |  | 172.5 |  | $ 172.5 | $ 172.5
Debt Instrument, Unamortized Discount | (3.0) |  |  | (3.0) |  | (7.4) |
Convertible Notes Payable | 169.5 |  |  | 169.5 |  | 165.1 |
Convertible Notes Payable, Current | (169.5) |  |  | (169.5) |  | (165.1) |
Convertible Notes Payable, Noncurrent | 0.0 |  |  | 0.0 |  | 0.0 |
Debt Instrument, Convertible, Carrying Amount of Equity Component | 29.9 |  |  | 29.9 |  | $ 29.9 |
Debt Instrument, Fair Value Disclosure | 192.5 |  |  | 192.5 |  |  |
Interest Expense, Debt, Excluding Amortization | 1.4 | $ 1.4 |  | 2.8 | $ 2.8 |  |
Amortization of Debt Issuance Costs | 0.2 | 0.3 |  | 0.5 | 0.5 |  |
Amortization of Debt Discount (Premium) | 2.0 | 1.8 |  | 3.9 | 3.6 |  |
Interest Expense, Debt | $ 3.6 | $ 3.5 |  | $ 7.2 | $ 6.9 |  |
Payments for Hedge, Financing Activities |  |  | $ 44.5 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  | $ 21.1050
Proceeds from issuance of warrants |  |  | $ 39.1 |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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