XML 64 R42.htm IDEA: XBRL DOCUMENT
v3.21.2

Financings and Capitalization (Forward Stock Contracts) (Details) - $ / shares | Jun. 30, 2021 | Dec. 22, 2020 | Sep. 15, 2020
--- | --- | --- | ---
Forward Contracts Entered Into September 15, 2020 And Maturing June 30, 2022 |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of Shares |  |  | 846,759
Initial forward price (in dollars per share) | $ 59.51 |  | $ 61.04
Forward Contracts Entered Into December 22, 2020 And Maturing June 22, 2022 |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of Shares |  | 115,595 |
Initial forward price (in dollars per share) | $ 60.80 | $ 61.81 |

X
- Definition The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=123477628&loc=d3e90205-114008 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879 + Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityForwardRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123477628&loc=d3e90205-114008 + Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityTypeAxis=cms_ForwardContractsEnteredIntoSeptember152020AndMaturingJune302022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityTypeAxis=cms_ForwardContractsEnteredIntoDecember222020AndMaturingJune222022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |