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Debt - Schedule of Debt Obligations (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt excluding financing lease liabilities | $ 1,238.0 |
Financing lease liabilities (Please refer to Note 13) | 10.3 | $ 8.8
Total debt | 1,248.3 | 673.5
Less current portion of long-term debt | 8.2 | 7.2
Long-term debt, less current portion | 1,115.4 | 660.6
Convertible Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Total debt excluding financing lease liabilities | 575.0 |
Term Debt and Convertible Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Less unamortized discount on Term Debt and Convertible Senior Notes | 109.0 | 1.2
Less unamortized debt issuance costs on Term Debt and Convertible Senior Notes | 15.7 | 4.5
Term Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total debt excluding financing lease liabilities | $ 663.0 | $ 664.7

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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