XML 127 R67.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Financings and Capitalization (Forward Stock Contracts) (Details) - $ / shares | Feb. 21, 2019 | Nov. 20, 2018 | Nov. 16, 2018
--- | --- | --- | ---
Forward Contracts Maturing May 16, 2020 |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of Shares |  |  | 2,017,783
Initial forward price (in dollars per share) |  |  | $ 49.06
Forward Contracts Maturing May 20, 2020 |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of Shares |  | 777,899 |
Initial forward price (in dollars per share) |  | $ 50.91 |
Forward Contracts Maturing August 21, 2020 |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Number of Shares | 2,083,340 |  |
Initial forward price (in dollars per share) | $ 52.27 |  |

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=6445032&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: | num: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=6445032&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_ForwardContractsMaturingMay162020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityTypeAxis=cms_ForwardContractsMaturingMay202020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ForwardContractIndexedToIssuersEquityTypeAxis=cms_ForwardContractsMaturingAugust212020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |