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Net Income Per Share and Stockholders' Equity, Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 07, 2016 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Apr. 22, 2016 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Payment of cash dividends to stockholders | $ |  | $ 37.7 | $ 35.0 | $ 32.4 |
Payment of quarterly cash dividends | $ / shares |  | $ 2.20 | $ 2.00 | $ 1.80 |
Repurchase of common shares pursuant to an authorization from the Board, shares | shares |  | 617,151 | 938,680 | 443,838 |
Weighted-average price of repurchases of common shares | $ / shares |  | $ 100.28 | $ 82.97 | $ 78.59 |
Repurchase of common shares pursuant to an authorization from the Board, value | $ |  | $ 61.9 | $ 77.8 | $ 34.9 |
Common shares available for additional share repurchase | $ |  | $ 148.7 | $ 110.5 |  |
Preferred Stock, Shares Authorized | shares |  | 5,000,000 | 5,000,000 |  |
Series A Preferred Stock [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Preferred Stock, Rights Conversion Ratio into Preferred Stock | 1 |  |  |  |
Preferred Stock, Shares Authorized | shares |  |  |  |  | 900,000

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