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Segment Reporting (Reconciliation Of Total Segment Operating Income To Consolidated Earnings Before Income Taxes) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Oct. 01, 2017
Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income/(loss) $ 1,116.1 $ 1,132.6    
Gain (Loss) on Disposition of Business 501.2 0.0    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain 1,326.3 0.0    
Interest income and other, net 88.2 24.1    
Interest expense (25.9) (23.8)    
Earnings before income taxes 3,005.9 1,132.9    
Operating Segments [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income/(loss) 1,428.6 1,418.5    
Corporate, Non-Segment [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income/(loss) (312.5) (285.9)    
Contract Termination [Member] | Restructuring Charges [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Business Exit Costs $ 16.6 $ 0.0 $ 15.7  
Forecast [Member] | Contract Termination [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Business Exit Costs       $ 143.2