Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

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Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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The cash outflow to reacquire common stock during the period.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Capital Stock Capital Stock (Details) - USD ($)	1 Months Ended	12 Months Ended
Capital Stock Capital Stock (Details) - USD ($)	Feb. 25, 2019	Dec. 31, 2018	Jul. 12, 2019	Jun. 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