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Earnings Per Share Earnings Per Share, Narrative (Details) $ / shares in Units, $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 22, 2016 $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2015 $ / shares shares
Tax Asset Rights Plan Series A Preferred [Line Items] |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |  | $ 0.01
Preferred Stock, Shares Authorized | shares |  | 5,000,000 |  | 5,000,000
Payments of Ordinary Dividends, Common Stock | $ |  | $ 16.3 | $ 14.0 |
Common Stock, Dividends, Per Share, Cash Paid |  | $ 0.90 | $ 0.80 |
Repurchase of common stock, shares | shares |  | 109,033 | 552,454 |
Treasury Stock Acquired, Average Cost Per Share |  | $ 79.04 | $ 75.21 |
Treasury Stock, Value, Acquired, Cost Method | $ |  | $ 8.6 | $ 41.5 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  | $ 114.7 |  |
Series A Junior Participating Preferred Stock |  |  |  |
Tax Asset Rights Plan Series A Preferred [Line Items] |  |  |  |
Preferred Stock, Rights Conversion Ratio into Preferred Stock | 1 |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.01 |  |  |
Preferred Stock, Shares Authorized | shares | 900,000 |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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