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Segment Information (Reconciliation Of Company's Consolidated Segment Operating Income To Consolidated Income Before Income Taxes) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Segment Reporting Information [Line Items]        
Consolidated operating income $ 77.4 $ 66.3 [1],[2] $ 231.1 $ 180.0 [1],[2]
Unallocated corporate expense (349.5) (284.9) [1] (1,014.7) (838.1) [1]
Restructuring charges (2.6) (1.6) [2] (6.8) (7.8) [2]
Acquired deferred revenue adjustment (9.5) (0.7) [2] (16.2) (1.5) [2]
Amortization of purchased intangible assets (49.8) (40.0) [2] (132.9) (109.1) [2],[3]
Stock-based compensation (18.8) (16.1) [2] (53.1) (45.0) [2],[3]
Amortization of acquired capitalized commissions 1.8 0.2 [2] 2.9 0.9 [2]
Amortization of acquisition-related inventory step-up 0.0 (2.2) [2] 0.0 (2.8) [2]
Acquisition / divestiture items (10.7) 0.3 [2] (34.8) (6.1) [2]
Non-operating income (expense), net: (13.3) 5.6 [1],[2] (21.1) 19.6 [1],[2]
Consolidated income before taxes 64.1 71.9 [1],[2] 210.0 199.6 [1],[2]
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Consolidated operating income 191.3 149.4 [2] 542.2 413.2 [2]
Corporate, Non-Segment [Member]        
Segment Reporting Information [Line Items]        
Unallocated corporate expense $ (24.3) $ (23.0) [2] $ (70.2) $ (61.8) [2]
[1] See Note 2 for a summary of adjustments
[2] See Note 2 for a summary of adjustments
[3] See Note 2 for a summary of adjustments