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Summary of Significant Accounting Policies Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impact on results of operations | $ 239.0 | $ 266.8 | $ 241.6 | $ 452.5 | $ 243.9 | $ 234.3 | $ 235.7 | $ 420.1 | $ 1,199.9 | $ 1,134.0 | $ 1,059.3
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment from adoption of ASU 2018-02 |  |  |  |  |  |  |  |  |  |  | 0.6
Impact on results of operations |  |  |  |  |  |  |  |  |  |  | 0.0
Impact on cash flows |  |  |  |  |  |  |  |  |  |  | $ 0.0

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