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Other Equity Matters Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 03, 2019 | Sep. 05, 2019 | Jun. 06, 2019 | Mar. 12, 2019 | Dec. 03, 2018 | Sep. 04, 2018 | Jun. 01, 2018 | Mar. 12, 2018 | Dec. 01, 2017 | Sep. 01, 2017 | Jun. 01, 2017 | Mar. 20, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 37.3 | $ 37.6 | $ 38.6 | $ 40.4 | $ 41.0 | $ 41.6 | $ 41.6 | $ 36.1 | $ 36.0 | $ 33.2 | $ 33.2 | $ 33.2 |  |  |
Cash dividends paid per common share | $ 0.52 | $ 0.52 | $ 0.52 | $ 0.52 | $ 0.52 | $ 0.52 | $ 0.52 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 0.45 | $ 2.08 | $ 2.01 | $ 1.80

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