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Recent Transactions (Details) $ / shares in Units, € in Millions, ₨ in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
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Jan. 29, 2015 USD ($) | Jan. 29, 2015 INR (₨) | Feb. 28, 2014 USD ($) | Sep. 30, 2015 USD ($) number_of_countries | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) number_of_countries | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) employee | Dec. 31, 2014 EUR (€) | Jul. 13, 2015 USD ($) $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Sales Revenue, Goods, Net |  |  |  | $ 1,884.0 | $ 2,032.1 | $ 5,900.1 | $ 6,313.2 |  |  |
Liabilities assumed from business acquired |  |  |  |  |  | 0.0 | 3.2 |  |  |
Debt assumed from business acquired |  |  |  |  |  | 0.0 | 40.3 |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 1,183.7 |  | 1,183.7 |  | $ 1,205.7 |  |
Cash paid, net of cash acquired |  |  |  |  |  | 12.6 | 106.4 |  |  |
Gain on previously held equity interest |  |  |  |  |  | $ 10.8 |  |  |  |
Remy International Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business acquisition, share price | $ / shares |  |  |  |  |  |  |  |  |  | $ 29.50
Business combination, implied enterprise value |  |  |  |  |  |  |  |  |  | $ 1,200.0
Number of countries in which entity operates | number_of_countries |  |  |  | 10 |  | 10 |  |  |  |
Entity number of employees | employee |  |  |  |  |  |  |  | 6,600 |  |
Sales Revenue, Goods, Net |  |  |  |  |  |  |  | $ 1,200.0 |  |
BERU Diesel Start Systems Pvt. Ltd. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Equity interest acquired | 51.00% |  |  |  |  |  |  |  |  |
Equity interest acquired, step acquisition | 100.00% |  |  |  |  |  |  |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired | $ 12.6 | ₨ 783.1 |  |  |  |  |  |  |  |
Gain on previously held equity interest |  |  |  | $ 0.0 | $ 0.0 | $ 10.8 | $ 0.0 |  |  |
Assets acquired | 16.0 |  |  |  |  |  |  |  |  |
Definite-lived intangible assets | 11.2 |  |  |  |  |  |  |  |  |
Assumed liabilities | 4.6 |  |  |  |  |  |  |  |  |
Nondeductible amount of goodwill | $ 13.9 |  |  |  |  |  |  |  |  |
Gustav Wahler GmbH u. Co. KG and its general partner |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Equity interest acquired |  |  | 100.00% |  |  |  |  |  |  |
Liabilities assumed from business acquired |  |  | $ 3.2 |  |  |  |  |  |  |
Debt assumed from business acquired |  |  | 40.3 |  |  |  |  |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Receivables, net |  |  | 52.4 |  |  |  |  |  |  |
Inventories, net |  |  | 46.8 |  |  |  |  |  |  |
Property, plant and equipment, net |  |  | 55.3 |  |  |  |  |  |  |
Goodwill |  |  | 74.6 |  |  |  |  |  |  |
Other intangible assets, net of tax |  |  | 42.7 |  |  |  |  |  |  |
Other assets and liabilities |  |  | (47.4) |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | (70.4) |  |  |  |  |  |  |
Total consideration, net of cash acquired |  |  | 154.0 |  |  |  |  |  |  |
Less: Assumed retirement-related liabilities |  |  | 3.2 |  |  |  |  |  |  |
Less: Assumed debt |  |  | 40.3 |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  |  |  |  | $ 110.5 | € 80.1 |
Nondeductible amount of goodwill |  |  | 56.9 |  |  |  |  |  |  |
Gustav Wahler GmbH u. Co. KG and its general partner | Customer Relationships |  |  |  |  |  |  |  |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Other intangible assets, net of tax |  |  | 24.9 |  |  |  |  |  |  |
Gustav Wahler GmbH u. Co. KG and its general partner | Know-how |  |  |  |  |  |  |  |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Other intangible assets, net of tax |  |  | 10.2 |  |  |  |  |  |  |
Gustav Wahler GmbH u. Co. KG and its general partner | Patented technology |  |  |  |  |  |  |  |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Other intangible assets, net of tax |  |  | 4.1 |  |  |  |  |  |  |
Trade Names | Gustav Wahler GmbH u. Co. KG and its general partner |  |  |  |  |  |  |  |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Other intangible assets, net of tax |  |  | $ 3.5 |  |  |  |  |  |  |
Minimum | Gustav Wahler GmbH u. Co. KG and its general partner |  |  |  |  |  |  |  |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  | 5 years |  |  |  |  |  |  |
Maximum | Gustav Wahler GmbH u. Co. KG and its general partner |  |  |  |  |  |  |  |  |  |
Aggregated estimated fair value of assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  | 15 years |  |  |  |  |  |  |

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