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Reportable Business Segments (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($)
Segment reporting information |  |
Number of reportable business segments | segment | 2 |
Net sales | $ 1,866.9 | $ 1,560.1
Segment operating income | 376.9 | 314.1
Operating Segment |  |
Segment reporting information |  |
Segment operating income | 402.4 | 337.6
Operating Segment | Interconnect Products and Assemblies |  |
Segment reporting information |  |
Net sales | 1,770.0 | 1,463.5
Segment operating income | 391.1 | 323.9
Operating Segment | Cable Products and Solutions |  |
Segment reporting information |  |
Net sales | 96.9 | 96.6
Segment operating income | 11.3 | 13.7
Inter-Segment |  |
Segment reporting information |  |
Net sales | 11.5 | 12.5
Inter-Segment | Interconnect Products and Assemblies |  |
Segment reporting information |  |
Net sales | 2.6 | 2.3
Inter-Segment | Cable Products and Solutions |  |
Segment reporting information |  |
Net sales | $ 8.9 | $ 10.2

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