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Debt - Schedule of Debt and Capital Lease Obligations (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of finance lease | $ 0.9 | $ 0.9
Current portion of debt | 0.9 | 0.9
Long-term debt | 904.5 | 925.5
Non-current portion of finance lease and other debt | 2.0 | 2.5
Total debt | 905.4 | 926.4
Senior unsecured credit facility |  |
Debt Instrument [Line Items] |  |
Long-term debt | 207.0 | 228.0
4.7% senior notes due 2025 |  |
Debt Instrument [Line Items] |  |
Senior notes | 300.0 | 300.0
4.7% senior notes due 2025 and 3.95% senior notes due 2027 |  |
Debt Instrument [Line Items] |  |
Senior notes --- original issue discount | (1.3) | (1.5)
Senior notes --- deferred financing costs | (3.2) | (3.5)
3.95% senior notes due 2027 |  |
Debt Instrument [Line Items] |  |
Senior notes | $ 400.0 | $ 400.0

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- Definition Amount, after accumulated amortization, of debt discount. + 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 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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