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Capital Stock Capital Stock (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 25, 2019 | Dec. 31, 2018 | Oct. 14, 2019 | Sep. 30, 2019 | 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) |  | 49,700,000 |  | 50,000,000.0 |
Maximum shares allowed for issuance (in shares) |  |  |  | 2,000,000.0 |
Par value (in dollars per share) |  |  |  | $ 10 |
Stock repurchase program amount |  |  |  |  | $ 200,000,000
Stock repurchase program remaining amount |  |  |  | $ 106,000,000 |
Stock repurchased and retired during period, shares |  | 610,177 |  |  |
Stock repurchase program amount used |  | $ 43,500,000 |  |  |
Average price per share (in dollars per share) |  | $ 71.22 |  |  |
ASR December 2018 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Accelerated share repurchased payment |  | $ 50,000,000 |  |  |
Stock repurchased and retired during period, shares |  | 700,000 |  |  |
ASR, initial price per share (in dollars per share) |  | $ 71.43 |  |  |
ASR February 2019 |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Stock repurchased and retired during period, shares | 37,387 |  |  |  |
ASR, final price per share (in dollars per share) | $ 67.81 |  |  |  |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Dividends declared (in dollars per share) |  |  | $ 0.15 |  |

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