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Reportable Business Segments and International Operations (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income | $ 278.9 us-gaap_OperatingIncomeLoss | $ 267.8 us-gaap_OperatingIncomeLoss | $ 255.8 us-gaap_OperatingIncomeLoss | $ 232.1 us-gaap_OperatingIncomeLoss | $ 241.4 us-gaap_OperatingIncomeLoss | $ 224.5 us-gaap_OperatingIncomeLoss | $ 224.0 us-gaap_OperatingIncomeLoss | $ 207.0 us-gaap_OperatingIncomeLoss | $ 1,034.6 us-gaap_OperatingIncomeLoss | $ 896.8 us-gaap_OperatingIncomeLoss | $ 828.3 us-gaap_OperatingIncomeLoss
Interest expense |  |  |  |  |  |  |  |  | (80.4)us-gaap_InterestExpense | (63.6)us-gaap_InterestExpense | (59.6)us-gaap_InterestExpense
Interest Income |  |  |  |  |  |  |  |  | 20.2 us-gaap_InterestIncomeOther | 15.0 us-gaap_InterestIncomeOther | 11.5 us-gaap_InterestIncomeOther
Stock-based compensation expense |  |  |  |  |  |  |  |  | (41.4)us-gaap_AllocatedShareBasedCompensationExpense | (36.1)us-gaap_AllocatedShareBasedCompensationExpense | (31.4)us-gaap_AllocatedShareBasedCompensationExpense
Acquisition-related expenses | (1.8)us-gaap_BusinessCombinationAcquisitionRelatedCosts | (2.5)us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | (2.0)us-gaap_BusinessCombinationAcquisitionRelatedCosts | (3.4)us-gaap_BusinessCombinationAcquisitionRelatedCosts | (2.5)us-gaap_BusinessCombinationAcquisitionRelatedCosts |  |  | (14.1)us-gaap_BusinessCombinationAcquisitionRelatedCosts | (6.0)us-gaap_BusinessCombinationAcquisitionRelatedCosts | (2.0)us-gaap_BusinessCombinationAcquisitionRelatedCosts
Income before income taxes |  |  |  |  |  |  |  |  | 972.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 846.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 778.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Operating Segment |  |  |  |  |  |  |  |  |  |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |  |  |  |  |  |  |  |
Segment operating income |  |  |  |  |  |  |  |  | 1,131.7 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 977.3 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 899.2 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Unallocated amount to segment |  |  |  |  |  |  |  |  |  |  |
Reconciliation of segment operating income to consolidated income before income taxes |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (80.4)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (63.6)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (59.6)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Interest Income |  |  |  |  |  |  |  |  | 20.2 us-gaap_InterestIncomeOther / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 15.0 us-gaap_InterestIncomeOther / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 11.5 us-gaap_InterestIncomeOther / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Stock-based compensation expense |  |  |  |  |  |  |  |  | (41.4)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (36.1)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (31.4)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Acquisition-related expenses |  |  |  |  |  |  |  |  | (14.1)us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (6.0)us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (2.0)us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Other costs, net |  |  |  |  |  |  |  |  | (43.5)us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (40.0)us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (38.9)us-gaap_OtherExpenses / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Income before income taxes |  |  |  |  |  |  |  |  | $ 972.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | $ 846.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | $ 778.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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