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Capital Stock Capital Stock (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Jul. 17, 2020 | Jun. 30, 2020 | Feb. 06, 2020 | May 08, 2017
Subsequent Event [Line Items] |  |  |  |  |
Shares of common stock authorized (in shares) | 100,000,000 |  | 100,000,000 |  |
Shares issued and outstanding (in shares) | 50,100,000 |  | 50,500,000 |  |
Maximum shares allowed for issuance (in shares) |  |  | 2,000,000.0 |  |
Par value (in dollars per share) |  |  | $ 10 |  |
250 Million Share Repurchase Program |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Stock repurchase program amount |  |  |  | $ 250,000,000 |
200 Million Share Repurchase Program |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Stock repurchase program amount |  |  |  |  | $ 200,000,000
Stock repurchased and retired during period, shares | 1,300,000 |  |  |  |
Stock repurchase program amount used | $ 94,000,000 |  |  |  |
Average price per share (in dollars per share) | $ 69.35 |  |  |  |
Stock repurchase program remaining amount |  |  | $ 106,000,000 |  |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Dividends declared (in dollars per share) |  | $ 0.15 |  |  |

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