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v3.21.2

Leases - Narrative (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Lessee, Lease, Description [Line Items] |
Operating And Finance Leases, Excluding Short Term Leases, Renewal Option | 10 years
Operating And Finance Leases, Excluding Short Term Leases, Termination Option | 1 year
Lessee, Finance Lease, Lease Not Yet Commenced, Liability | $ 2.0
Minimum |
Lessee, Lease, Description [Line Items] |
Operating And Finance Leases, Excluding Short Term Leases, Weighted-Average Remaining Lease Term | 1 year
Maximum |
Lessee, Lease, Description [Line Items] |
Operating And Finance Leases, Excluding Short Term Leases, Weighted-Average Remaining Lease Term | 30 years

X
- Definition Lessee, Finance Lease, Lease Not Yet Commenced, Liability + References No definition available. + Details
Name: | hsc_LesseeFinanceLeaseLeaseNotYetCommencedLiability
Namespace Prefix: | hsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating And Finance Leases, Excluding Short Term Leases, Renewal Option + References No definition available. + Details
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Namespace Prefix: | hsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Operating And Finance Leases, Excluding Short Term Leases, Termination Option + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Operating And Finance Leases, Excluding Short Term Leases, Weighted-Average Remaining Lease Term + References No definition available. + Details
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Namespace Prefix: | hsc_
Data Type: | xbrli:durationItemType
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |