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Reportable Business Segments and International Operations (Details) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Number of reportable business segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Net sales | $ 1,943.9 | $ 1,840.8 | $ 1,666.5 | $ 1,560.1 | $ 1,651.1 | $ 1,635.9 | $ 1,548.2 | $ 1,451.2 | $ 7,011.3 | $ 6,286.4 | $ 5,568.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 226.8 | 217.0 | 171.6
Segment operating income | 399.4 | $ 377.9 | $ 336.2 | $ 314.1 | 339.1 | $ 326.3 | $ 300.3 | $ 239.4 | 1,427.6 | 1,205.2 | 1,104.7
Segment assets (excluding goodwill) | 5,932.9 |  |  |  | 4,784.6 |  |  |  | 5,932.9 | 4,784.6 |
Operating Segment |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,011.3 | 6,286.4 | 5,568.7
Depreciation and amortization |  |  |  |  |  |  |  |  | 221.0 | 211.7 | 165.3
Segment operating income |  |  |  |  |  |  |  |  | 1,529.4 | 1,333.1 | 1,198.6
Segment assets (excluding goodwill) | 5,932.9 |  |  |  | 4,784.6 |  |  |  | 5,932.9 | 4,784.6 | 4,743.9
Capital expenditures |  |  |  |  |  |  |  |  | 226.0 | 190.2 | 171.6
Operating Segment | Interconnect Products and Assemblies |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,606.9 | 5,922.3 | 5,239.1
Depreciation and amortization |  |  |  |  |  |  |  |  | 214.7 | 206.8 | 162.3
Segment operating income |  |  |  |  |  |  |  |  | 1,475.2 | 1,280.3 | 1,158.3
Segment assets (excluding goodwill) | 5,732.6 |  |  |  | 4,587.5 |  |  |  | 5,732.6 | 4,587.5 | 4,580.4
Capital expenditures |  |  |  |  |  |  |  |  | 220.4 | 186.2 | 167.1
Operating Segment | Cable Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 404.4 | 364.1 | 329.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 6.3 | 4.9 | 3.0
Segment operating income |  |  |  |  |  |  |  |  | 54.2 | 52.8 | 40.3
Segment assets (excluding goodwill) | $ 200.3 |  |  |  | $ 197.1 |  |  |  | 200.3 | 197.1 | 163.5
Capital expenditures |  |  |  |  |  |  |  |  | 5.6 | 4.0 | 4.5
Inter-Segment |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 50.4 | 36.9 | 28.8
Inter-Segment | Interconnect Products and Assemblies |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9.7 | 6.9 | 7.2
Inter-Segment | Cable Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 40.7 | $ 30.0 | $ 21.6

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