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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) € in Millions | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2021 EUR (€) | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Jun. 14, 2019 USD ($) | Nov. 06, 2017 USD ($)
Debt Instrument |  |  |  |  |  |  |  |
Total debt, net of unamortized discount and debt issuance costs | $ 558,300,000 |  |  |  | $ 442,500,000 |  |  |
Less: current maturities | 255,200,000 |  |  |  | 220,900,000 |  |  |
Long-term debt | 303,100,000 |  |  |  | 221,600,000 |  |  |
Foreign currency transaction gain | 200,000 | $ (300,000) |  |  |  |  |  |
Convertible Notes, due 2024 | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Unamortized debt issuance costs | (3,600,000) |  |  | $ (3,900,000) | (3,100,000) |  |  |
Principal amount | 258,800,000 | $ 258,800,000 |  |  | 258,800,000 |  |  | $ 258,800,000
Unamortized discount | 0 |  |  |  | (34,800,000) |  |  |
Convertible Debt | 255,200,000 |  |  |  | 220,900,000 |  |  |
Debt instrument stated interest rate (percent) |  |  |  |  |  |  |  | 1.00%
Revolving Credit Facility | Credit Facilities 2019 |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Unamortized debt issuance costs | (4,700,000) |  |  |  | (5,000,000.0) |  |  |
Senior secured revolving credit facility and term loan, net of debt issuance costs | 303,100,000 |  |  |  | 221,600,000 |  |  |
Revolving Credit Facility | Term loan |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Long term debt | $ 103,100,000 |  |  |  | $ 103,100,000 |  |  |
Principal amount |  |  |  |  |  |  | $ 450,000,000.0 |
Debt instrument stated interest rate (percent) | 2.00% |  | 2.00% |  | 2.50% | 2.50% |  |
Revolving Credit Facility | Senior secured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Long term debt | $ 204,700,000 |  |  |  | $ 123,500,000 |  |  |
Unamortized debt issuance costs | $ (7,300,000) |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 550,000,000.0 |
Weighted average interest rate (percent) | 1.80% |  | 1.80% |  | 2.10% | 2.10% |  |
Letters of credit outstanding | $ 53,100,000 |  |  |  |  |  |  |
Line of credit remaining borrowing amount | 292,200,000 |  |  |  |  |  |  |
Revolving Credit Facility | Euro senior secured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Long term debt | 83,800,000 |  | € 71.5 |  | $ 87,700,000 | € 71.5 |  |
Foreign currency transaction gain | 3,900,000 |  |  |  |  |  |  |
Revolving Credit Facility | Foreign facilities |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Foreign facilities | 0 |  |  |  | $ 0 |  |  |
Maximum borrowing capacity | 80,900,000 |  |  |  |  |  |  |
Weighted average interest rate (percent) |  |  |  |  | 1.30% | 1.30% |  |
Letters of credit outstanding | 51,600,000 |  |  |  | $ 47,700,000 |  |  |
Revolving Credit Facility Sub-limit - Letters of Credit | Senior secured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Maximum borrowing capacity | 100,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility Sub-limit - Discretionary Letters of Credit | Senior secured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Maximum borrowing capacity | 250,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility Sub-limit - Swingline | Senior secured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 50,000,000.0 |  |  |  |  |  |  |

X
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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