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Shareholders' Equity - Stock Buyback Program (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 12, 2019 | Feb. 14, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Purchase of treasury shares | $ 0 | $ 95,175,000 | $ 0 |  |
Common Stock | February 2018 Stock Buyback Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 200,000,000
Purchase of treasury shares (in shares) |  | 4,210,254 |  |  |
Purchase of treasury shares |  | $ 95,200,000 |  |  |
Amended Credit Agreement |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 100,000,000.0 |  |  |  |
Line of Credit | Revolving Credit Facility | Amended Credit Agreement |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 900,000,000.0 | $ 900,000,000

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