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Assets Held for Sale (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020
Assets Held for Sale [Abstract] |  |  |  |  |  |
Impairment of carrying value |  | $ (134.4) | $ 0.0 | $ (134.4) | $ 0.0 |
ASSETS [Abstract] |  |  |  |  |  |
Total assets held for sale |  | 92.9 |  | 92.9 |  | $ 0.0
LIABILITIES [Abstract] |  |  |  |  |  |
Total liabilities held for sale |  | 83.2 |  | 83.2 |  | $ 0.0
Liquid-Cooled Automotive Business [Member] |  |  |  |  |  |
Assets Held for Sale [Abstract] |  |  |  |  |  |
Impairment of carrying value |  | 132.7 |  |  |  |
Long-lived assets |  | 0.0 |  | 0.0 |  |
ASSETS [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  | 5.3 |  | 5.3 |  |
Trade accounts receivables - net |  | 51.7 |  | 51.7 |  |
Inventories |  | 17.7 |  | 17.7 |  |
Other current assets |  | 11.6 |  | 11.6 |  |
Property, plant and equipment - net |  | 132.0 |  | 132.0 |  |
Other noncurrent assets |  | 7.3 |  | 7.3 |  |
Impairment of carrying value |  | (132.7) |  | (132.7) |  |
Total assets held for sale |  | 92.9 |  | 92.9 |  |
LIABILITIES [Abstract] |  |  |  |  |  |
Short-term debt |  | 6.0 |  | 6.0 |  |
Accounts payable |  | 36.9 |  | 36.9 |  |
Accrued compensation and employee benefits |  | 10.2 |  | 10.2 |  |
Other current liabilities |  | 12.7 |  | 12.7 |  |
Pensions |  | 12.4 |  | 12.4 |  |
Other noncurrent liabilities |  | 5.0 |  | 5.0 |  |
Total liabilities held for sale |  | 83.2 |  | $ 83.2 |  |
Liquid-Cooled Automotive Business [Member] | Forecast [Member] | Minimum [Member] |  |  |  |  |  |
LIABILITIES [Abstract] |  |  |  |  |  |
Loss on sale of transaction | $ 15.0 |  |  |  |  |
Liquid-Cooled Automotive Business [Member] | Forecast [Member] | Maximum [Member] |  |  |  |  |  |
LIABILITIES [Abstract] |  |  |  |  |  |
Loss on sale of transaction | $ 25.0 |  |  |  |  |
Automotive [Member] |  |  |  |  |  |
Assets Held for Sale [Abstract] |  |  |  |  |  |
Impairment of carrying value |  | $ 1.7 |  |  |  |

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Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mod_AutomotiveSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |