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Reporting Segments and Related Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer sales |  |  |  |  |  |  |  |  |  | $ 9,799.3 | $ 9,071.0 | $ 8,023.2
Net sales |  | $ 2,586.4 | $ 2,416.2 | $ 2,389.7 | $ 2,407.0 | $ 2,259.0 | $ 2,214.2 | $ 2,329.2 | $ 2,268.6 | 9,799.3 | 9,071.0 | 8,023.2
Year-end assets |  | 9,787.6 |  |  |  | 8,834.7 |  |  |  | 9,787.6 | 8,834.7 | 9,210.5
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 407.8 | 391.4 | 320.2
Long-lived asset expenditures | [1] |  |  |  |  |  |  |  |  | 560.0 | 500.6 | 577.3
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer sales |  |  |  |  |  |  |  |  |  | 9,799.3 | 9,071.0 | 8,023.2
Net sales |  |  |  |  |  |  |  |  |  | 9,799.3 | 9,071.0 | 8,023.2
Year-end assets |  | 8,636.7 |  |  |  | 7,347.0 |  |  |  | 8,636.7 | 7,347.0 | 7,702.9
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 379.7 | 366.4 | 297.2
Long-lived asset expenditures | [1] |  |  |  |  |  |  |  |  | 547.1 | 481.5 | 554.2
Engine [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer sales |  |  |  |  |  |  |  |  |  | 6,009.0 | 5,547.3 | 5,466.5
Inter-segment sales |  |  |  |  |  |  |  |  |  | 52.5 | 42.8 | 33.5
Net sales |  |  |  |  |  |  |  |  |  | 6,061.5 | 5,590.1 | 5,500.0
Year-end assets |  | 4,732.9 |  |  |  | 4,134.6 |  |  |  | 4,732.9 | 4,134.6 | 4,017.8
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 218.8 | 211.9 | 200.2
Long-lived asset expenditures | [1] |  |  |  |  |  |  |  |  | 305.5 | 298.7 | 332.4
Drivetrain [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Customer sales |  |  |  |  |  |  |  |  |  | 3,790.3 | 3,523.7 | 2,556.7
Inter-segment sales |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 3,790.3 | 3,523.7 | 2,556.7
Year-end assets |  | 3,903.8 |  |  |  | 3,212.4 |  |  |  | 3,903.8 | 3,212.4 | 3,685.1
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 160.9 | 154.5 | 97.0
Long-lived asset expenditures | [1] |  |  |  |  |  |  |  |  | 241.6 | 182.8 | 221.8
Inter-segment eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment sales |  |  |  |  |  |  |  |  |  | (52.5) | (42.8) | (33.5)
Net sales |  |  |  |  |  |  |  |  |  | (52.5) | (42.8) | (33.5)
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Year-end assets | [2] | $ 1,150.9 |  |  |  | $ 1,487.7 |  |  |  | 1,150.9 | 1,487.7 | 1,507.6
Depreciation and amortization | [2] |  |  |  |  |  |  |  |  | 28.1 | 25.0 | 23.0
Long-lived asset expenditures | [1],[2] |  |  |  |  |  |  |  |  | $ 12.9 | $ 19.1 | $ 23.1
[1] | Long-lived asset expenditures include capital expenditures and tooling outlays.
[2] | Corporate assets include investments and other long-term receivables and deferred income taxes.

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