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Net Income Per Share and Stockholders' Equity, Narrative (Details) - USD ($) shares in Millions, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 17, 2018
Earnings Per Share [Abstract] |  |  |
Dividends paid | $ 28.5 | $ 26.4 |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  | 100.0
Availability remaining to repurchase common shares pursuant to stock repurchase program | $ 178.3 |  |

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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