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Recent Accounting Pronouncements Adoption of 2016-13 - Expected Credit Loss - Adjustments for New Accounting Pronouncement [Member] - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Receivable [Domain] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Balance as of December 31, 2020 - Prior to Adoption of ASU 2016-13 |  |  | $ 578.4
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ (1.6) |  |
Balance as of January 1, 2020 - Subsequent to Adoption of ASU 2016-13 |  | $ 576.8 |
Other Current Assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Balance as of December 31, 2020 - Prior to Adoption of ASU 2016-13 |  |  | 153.4
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | (0.1) |  |
Balance as of January 1, 2020 - Subsequent to Adoption of ASU 2016-13 |  | 153.3 |
Deferred Income Tax Asset |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Balance as of December 31, 2020 - Prior to Adoption of ASU 2016-13 |  |  | 138.1
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 0.5 |  |
Balance as of January 1, 2020 - Subsequent to Adoption of ASU 2016-13 |  | 138.6 |
Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Balance as of December 31, 2020 - Prior to Adoption of ASU 2016-13 |  |  | $ 2,372.4
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ (1.2) |  |
Balance as of January 1, 2020 - Subsequent to Adoption of ASU 2016-13 |  | $ 2,371.2 |

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