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Shareholders' Equity (Narrative) (Details) - Class A Common Stock [Member] - USD ($) $ in Millions	Mar. 31, 2021	Nov. 02, 2020
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.

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Amount remaining of a stock repurchase plan authorized.

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