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Shareholders' Equity (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2018 | Apr. 30, 2017 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Feb. 28, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends declared (in dollars per share) |  |  |  | $ 0.7 | $ 0.7 | $ 0.60 | $ 0.60 | $ 0.6 | $ 0.6 | $ 0.48 | $ 0.48 | $ 0.48 |  | $ 2.60 | $ 2.16 | $ 1.71
Dividend declared and paid in same quarter (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.48 |  |  |  |  |  |
Cash paid for dividends declared in prior period (in dollars per share) |  |  |  | $ 0.7 | $ 0.6 | $ 0.6 | $ 0.6 | $ 0.6 | $ 0.48 |  | $ 0.48 |  |  |  |  |
Term of stock repurchase program | 24 months | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 1,000,000,000.0 | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cost of treasury stock, acquired during the period |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 | $ 575,039,000 | $ 224,998,000 | $ 299,960,000
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for dividends declared in prior period (in dollars per share) |  |  | $ 0.7 |  |  |  |  |  |  |  |  |  |  |  |  |
May 2018 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares acquired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000.0 |  |
Total cost of treasury stock, acquired during the period |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |
Remaining authorized repurchase amount |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |
April 2017 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares acquired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 | 1,800,000 |
Total cost of treasury stock, acquired during the period |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 | $ 225,000,000 |

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