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Shareholders' Equity and Stock-Based Compensation (Details 7) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 18, 2013 | Jan. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 18, 2013 | Feb. 16, 2012
Common stock repurchased (in shares) |  |  | 4,852,000 us-gaap_TreasuryStockSharesAcquired | 3,493,000 us-gaap_TreasuryStockSharesAcquired | 3,606,000 us-gaap_TreasuryStockSharesAcquired |  |
Total cash consideration paid for common stock repurchased |  |  | $ 488.8 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 260.2 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 245.6 us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Dividends |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) |  |  | $ 1.50 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.00 us-gaap_CommonStockDividendsPerShareDeclared |  |
Dividends declared |  |  | 63.2 us-gaap_DividendsCommonStockCash | 45.5 us-gaap_DividendsCommonStockCash | 50.9 us-gaap_DividendsCommonStockCash |  |
Preferred Stock |  |  |  |  |  |  |
Authorized no par value preferred stock (in shares) |  |  | 3,000,000 us-gaap_PreferredStockSharesAuthorized | 3,000,000 us-gaap_PreferredStockSharesAuthorized | 3,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Common Stock In Treasury |  |  |  |  |  |  |
Authorized repurchase amount under the written trading plan | 500.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  | 500.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 350.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Common stock repurchased (in shares) | 115,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 1,514,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 4,852,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 3,493,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 3,606,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Total cash consideration paid for common stock repurchased | 11.2 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 104.4 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 488.8 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 144.6 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 245.6 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Common Stock in Treasury |  |  |  |  |  |  |
Decrease in stock by the settlement of restricted stock units |  |  | 13.8 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 14.2 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 6.1 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Increase in the stock for common stock surrendered by recipients of restricted stock as a means of funding minimum income tax withholding |  |  | $ 7.9 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 11.0 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 1.8 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |

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