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Recent Authoritative Accounting Guidance (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Stockholders' Equity Attributable to Parent | $ 1,959.8 |  | $ 2,013.9
Off-Balance Sheet, Credit Loss, Liability | $ 3.7 |  | $ 0.0
Accounting Standards Update 2016-13 | Adjustments for New Accounting Principle, Early Adoption [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss |  | $ 30.0 |
Off-Balance Sheet, Credit Loss, Liability |  | 2.3 |
Deferred Income Tax Assets, Net |  | 8.2 |
Accounting Standards Update 2016-13 | Adjustments for New Accounting Principle, Early Adoption [Member] | Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Stockholders' Equity Attributable to Parent |  | $ 24.1 |

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