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v3.21.1

Basis of Presentation and Principles of Consolidation (Narrative) (Details) $ / shares in Units, $ in Millions | Mar. 04, 2021 | Mar. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | ---
Stock split conversion ratio | 2 |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.001 |  |  |
Total equity |  | $ 5,521.7 | $ 5,451.9 | $ 4,445.7 | $ 4,596.2
Common Stock |  |  |  |  |
Total equity |  | 0.6 | 0.6 | 0.6 | 0.6
Common Stock | Stock Split [Member] |  |  |  |  |
Total equity |  | 0.3 | 0.3 | 0.3 | 0.3
Additional Paid in Capital |  |  |  |  |
Total equity |  | 2,105.7 | 2,068.1 | 1,720.3 | 1,683.0
Additional Paid in Capital | Stock Split [Member] |  |  |  |  |
Total equity |  | $ (0.3) | $ (0.3) | $ (0.3) | $ (0.3)

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