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Statements of Consolidated Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |
Weighted average repurchase price (in dollars per share) | $ 92.95 | $ 95.00 | $ 98.55 | $ 108.07 | $ 104.74 | $ 104.50
Repurchase amount remaining | $ 108.9 |  |  |  |  |
Cash dividends declared (in dollars per share) |  | $ 0.60 | $ 0.60 | $ 0.55 | $ 0.55 | $ 0.55

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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