XML 76 R82.htm IDEA: XBRL DOCUMENT
v3.19.2

Pension and Other Postretirement Benefits - Schedule of Fair Values of Other Postretirement Benefit Plans by Asset Category (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 119.0 | 117.9 | $ 117.0
Other Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Other Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 35.3 | 37.6 |
Other Benefits | Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 83.7 | 80.3 |
Other Benefits | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 83.7 | 80.3 |
Other Benefits | Commingled funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Other Benefits | Commingled funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Other Benefits | Commingled funds | Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 83.7 | 80.3 |
Other Benefits | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 27.1 | 23.0 |
Other Benefits | Short-term investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Other Benefits | Short-term investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 27.1 | 23.0 |
Other Benefits | Short-term investments | Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Other Benefits | Government agency bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 4.8 | 8.7 |
Other Benefits | Government agency bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Other Benefits | Government agency bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 4.8 | 8.7 |
Other Benefits | Government agency bonds | Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Other Benefits | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3.4 | 5.4 |
Other Benefits | Corporate bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Other Benefits | Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3.4 | 5.4 |
Other Benefits | Corporate bonds | Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 0.0 | 0.0 |
Other Benefits | Mortgage/asset backed securities and other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 0.5 |
Other Benefits | Mortgage/asset backed securities and other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 0.0 |
Other Benefits | Mortgage/asset backed securities and other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | 0.5 |
Other Benefits | Mortgage/asset backed securities and other | Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets |  | $ 0.0 |

X
- 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
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=crs_CommingledFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=crs_MortgageBackedSecuritiesAssetBackedSecuritiesAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |