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Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |
Unrecognized tax benefit — beginning of year | $ 322.9 | $ 391.1 | $ 92.1 |  | $ 96.3
Additions for current year tax positions | 0.0 |  | 13.4 | $ 0.0 |
Additions for prior year tax positions | 0.0 |  | 35.7 | 154.9 |
Reductions for prior year tax positions | (9.1) |  | (5.2) | (11.7) |
Settlements | (47.3) |  | (8.9) | (112.5) |
Reductions due to expirations of statute of limitations | (7.0) |  | 0.0 | $ (34.9) |
Unrecognized Tax Benefits, Decrease Resulting from Acquisition | (4.8) |  |  |  |
(Reduction) addition due to acquisition |  | 264.0 | 0.0 |  |
Unrecognized tax benefit — end of year | $ 322.9 | $ 391.1 | $ 92.1 |  |

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