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Equity (Share Activity) (Narrative) (Details) - USD ($) shares in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 19, 2020 | Dec. 21, 2018 | Sep. 11, 2018 | Mar. 29, 2018 | Feb. 25, 2016
Equity, Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) | 3.6 |  | 7.2 |  |  |  |  |
Treasury stock acquired, value | $ 120,228,000 | $ 602,000 | $ 319,001,000 |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 158,600,000 |  |  |  |  |  |  |
September 2018 Share Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) | 0.6 |  | 2.9 |  |  |  |  |
Treasury stock acquired, value | $ 28,800,000 |  | $ 120,600,000 |  |  |  |  |
Share repurchase program, amount authorized, value |  |  |  |  |  | $ 150,000,000 |  |
December 2018 Share Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) | 3.0 |  |  |  |  |  |  |
Treasury stock acquired, value | $ 91,400,000 |  |  |  |  |  |  |
Share repurchase program, amount authorized, value |  |  |  |  | $ 100,000,000 |  |  |
Stock repurchase program, remaining authorized repurchase amount | 8,600,000 |  |  |  |  |  |  |
2016 Share Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  | 2.0 |  |  |  |  |
Treasury stock acquired, value |  |  | $ 98,400,000 |  |  |  |  |
Share repurchase program, amount authorized, value |  |  |  |  |  |  |  | $ 100,000,000
March 2018 Share Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  | 2.3 |  |  |  |  |
Treasury stock acquired, value |  |  | $ 100,000,000 |  |  |  |  |
Share repurchase program, amount authorized, value |  |  |  |  |  |  | $ 100,000,000 |
March 2020 Share Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share repurchase program, amount authorized, value |  |  |  | $ 150,000,000 |  |  |  |
Stock repurchase program, remaining authorized repurchase amount | $ 150,000,000 |  |  |  |  |  |  |

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