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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 28, 2019 | Feb. 16, 2018 | Jan. 12, 2017 | Jun. 04, 2015 | May 20, 2010 | Dec. 31, 2007
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares registered | 400,000,000 | 400,000,000 |  |  |  |  |  |  |
Common stock, shares issued | 112,433,000 | 116,446,000 |  |  |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  | 5,800,000 |  |  |  |  |  |  |
Shares registered |  |  |  |  |  |  |  |  | 4,000,000
Shares reclassified as authorized and unissued | 1,200,000 |  |  |  |  |  |  |  |
Stock Repurchase Program One [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized |  |  |  |  |  |  | $ 1,000.0 |  |
Stock Repurchase Program Two [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized |  |  |  |  |  |  | $ 1,000.0 |  |
Stock repurchased, shares |  | 42,163 | 5,300,000 |  |  |  |  |  |
Stock repurchased, value |  | $ 4.4 | $ 545.7 |  |  |  |  |  |
Weighted average price per share |  | $ 104.81 | $ 102.14 |  |  |  |  |  |
Stock Repurchase Program Three [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized |  |  |  |  |  | $ 1,000.0 |  |  |
Stock repurchased, value |  | $ 850.0 |  |  |  |  |  |  |
Weighted average price per share |  | $ 146.17 |  |  |  |  |  |  |
Stock Repurchase Program Four [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized |  |  |  |  | $ 1.0 |  |  |  |
Stock repurchased, shares | 5,000,000 |  |  |  |  |  |  |  |
Stock repurchased, value | $ 795.5 |  |  |  |  |  |  |  |
Weighted average price per share | $ 159.87 |  |  |  |  |  |  |  |
Stock Repurchase Program Four [Member] | Class A Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, remaining authorization |  |  |  | $ 204.5 |  |  |  |  |
2010 Plan [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Maximum issuance of shares | 15,000,000 |  |  |  |  |  |  | 15,000,000 |
Common stock, shares issued | 0 | 487,963 | 0 |  |  |  |  |  |

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