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Summary of Significant Accounting Policies Summary of Significant Accounting Details, Noncontrolling Interest (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |  |
Redeemable Noncontrolling Interest | $ 7.8 | $ 8.6 | $ 0.0 | $ 3.8
Noncontrolling Interest, Increase from Business Combination |  | 8.4 |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  | $ (3.8) |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest | (0.3) | 0.2 |  |
Payments to Noncontrolling Interests | (0.5) |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | $ 430.8 | 404.2 |  |
Additional Paid-in Capital [Member] |  |  |  |
Redeemable Noncontrolling Interest, Equity, Redemption Value |  | $ 2.3 |  |

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