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New Accounting Standards Cumulative impact upon adoption of ASC Topic 326 (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Adjustment due to adoption of ASC Topic 326 [Line Items] |  |  |
Trade receivables, allowances | $ (81.3) | $ (71.7) | $ (68.1)
Deferred Income Tax Assets, Net | 235.3 | 250.9 | 245.4
Contract with Customer, Asset, Allowance for Credit Loss | (3.2) | (1.7) | 0.0
Loan loss guarantee reserve | 45.7 | 15.1 |
Retained earnings | $ 3,725.9 | 3,573.4 | $ 3,588.3
Accounting Standards Update 2016-13 [Member] |  |  |
Adjustment due to adoption of ASC Topic 326 [Line Items] |  |  |
Trade receivables, allowances |  | (3.6) |
Deferred Income Tax Assets, Net |  | 5.5 |
Contract with Customer, Asset, Allowance for Credit Loss |  | (1.7) |
Loan loss guarantee reserve |  | 15.1 |
Retained earnings |  | $ (14.9) |

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