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v3.20.4

Commitments and Contingencies (Textuals) (Details) $ in Millions |  | 12 Months Ended | 18 Months Ended
--- | --- | --- | ---
Mar. 01, 2019 USD ($) ft² | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Deferred income |  | $ 10.1 | $ 10.2 |  | $ 10.2
Expense for known and future asbestos-related litigation |  | 5.6 | 3.1 | $ 4.0 |
Area of leased office building (in square feet) | ft² | 192,000 |  |  |  |
Purchase price of property at end of lease term | $ 41.2 |  |  |  |
Percentage of lease balance as final payment end of lease term | 87.00% |  |  |  |
Debt covenant, debt not paid when due | $ 75.0 |  |  |  |
Insurance recoveries received |  | 0.0 | 243.2 | $ 124.3 | 367.5
Marshalltown Wind Storm [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Insurance recoveries received |  | 6.6 |  |  |
Other Current Liabilities [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Deferred income |  | 10.1 | 10.2 |  | 10.2
Other Noncurrent Liabilities [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Deferred income |  | $ 27.9 | $ 22.1 |  | $ 22.1

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