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Shareholders' Equity (Narrative) (Details) - Class A Common Stock [Member] - USD ($) $ in Millions | Mar. 31, 2021 | Nov. 02, 2020
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New Plan [Member] |  |
Class of Stock [Line Items] |  |
Stock repurchase program, authorized |  | $ 1,000.0
Stock repurchase program, remaining authorization | $ 475.1 |
Prior Plan [Member] |  |
Class of Stock [Line Items] |  |
Stock repurchase program, remaining authorization |  | $ 124.3

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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