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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2017
Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends declared (in dollars per share) |  |  | $ 0.6 | $ 0.6 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.375 | $ 0.375 | $ 0.375 |  |  |  |
Dividend declared and paid in same quarter (in dollars per share) |  |  |  |  |  | 0.48 |  |  | $ 0.375 | 0.375 |  |  |  |  |
Cash paid for dividends declared in prior period (in dollars per share) |  |  | $ 0.6 | $ 0.48 | $ 0.48 | $ 0.48 | $ 0.48 |  |  | $ 0.48 |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Treasury stock, shares acquired |  |  |  | 1.8 |  |  |  |  |  |  |  |  |  |  |
Total cost of treasury stock, acquired during the period |  |  |  | $ 225,000,000 |  |  |  |  |  |  |  | $ 224,998,000 | $ 299,960,000 | $ 200,000,000 |
Remaining authorized repurchase amount |  |  | $ 275,000,000 |  |  |  |  |  |  |  |  | 275,000,000 |  |  |
Treasury stock, value |  |  | 1,378,306,000 |  |  |  | $ 1,153,308,000 |  |  |  |  | 1,378,306,000 | $ 1,153,308,000 |  |
October 2015 Stock Repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  | $ 500,000,000 |
Treasury stock, shares acquired |  |  |  |  |  |  |  |  |  |  | 2.1 |  | 4.1 |  |
Total cost of treasury stock, acquired during the period |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  | $ 300,000,000 |  |
Treasury stock, value |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for dividends declared in prior period (in dollars per share) |  | $ 0.6 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event | October 2015 Stock Repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares acquired | 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cost of treasury stock, acquired during the period | $ 186,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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