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Shareholders' Equity - Stock Buyback Program and Prospectus Supplement (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Apr. 30, 2018 | Feb. 14, 2018 | Nov. 09, 2017
Common shares | February 2018 Stock Buyback Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 200,000,000 |
Prospectus Supplement |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Maximum common stock value authorized under prospectus supplement |  |  |  | $ 150,000,000
Issuance of common stock under prospectus supplement (in shares) | 0 |  |  |
Amended Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Maximum borrowing capacity |  | $ 900,000,000 |  |

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