Business Combination Consideration Transferred Equity Interests Issued And Issuable Amount, No Expiration Date

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- Definition

Stock Repurchased and Retired During Period, Average Cost Per Share

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

Amount remaining of a stock repurchase plan authorized.

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- Definition

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

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Changes in Stockholders' Equity (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2018	Sep. 30, 2018	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased			$ 84,300,000
Stock repurchase program, authorized amount		$ 215,700,000.0	215,700,000.0
Stock repurchase program, outstanding balance authorized to be repurchased		247,100,000	247,100,000
Stock repurchase program, value of remaining number of shares authorized to be repurchased		31,400,000	$ 31,400,000
Open Market Transaction
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased, shares			534,403
Shares repurchased			$ 34,300,000
Shares repurchased, in dollars per share			$ 64.14
September 2018 ASR Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount		$ 50,000,000	$ 50,000,000
Shares repurchased, shares		638,978
Subsequent Event \| September 2018 ASR Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased, shares	197,848