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Business Combinations - Business Combinations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 06, 2017 | Mar. 01, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Adjusted purchase price, net of cash acquired |  |  | $ 9.4 | $ 1.3 | $ 895.5 |  |
Goodwill |  |  | $ 699.1 | $ 1,141.8 | 1,654.3 |  |
Metaldyne Performance Group, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | $ 953.5 |  |  |  |  |  |
Adjustment to Contractual Purchase Price - Existing Payable Balance |  |  |  |  |  | $ (12.4) |
Share consideration | 576.7 |  |  |  |  |  |
Total consideration transferred | $ 1,530.2 |  |  |  | $ 1,500.0 |  |
Fair value of MPG noncontrolling interests |  |  |  |  |  | 3.6 |
Total fair value of MPG |  |  |  |  |  | 1,533.8 |
Cash and cash equivalents acquired |  |  |  |  |  | (202.1) |
Accounts receivable |  |  |  |  |  | 403.1 |
Inventories |  |  |  |  |  | 199.0 |
Prepaid expenses and other long-term assets |  |  |  |  |  | 119.9 |
Property, plant and equipment |  |  |  |  |  | 971.8 |
Intangible assets |  |  |  |  |  | 1,223.1 |
Total assets acquired |  |  |  |  |  | 3,119.0 |
Accounts payable |  |  |  |  |  | 287.8 |
Accrued expenses and other |  |  |  |  |  | 137.7 |
Deferred income tax liabilities |  |  |  |  |  | 580.2 |
Debt |  |  |  |  |  | 1,918.7 |
Postretirement benefits and other long-term liabilities |  |  |  |  |  | 54.1 |
Net assets acquired |  |  |  |  |  | 140.5 |
Goodwill |  |  |  |  |  | $ 1,393.3 |
Percentage of equity interests acquired |  |  |  |  |  | 100.00% |
USM Mexico Manufacturing LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  | $ 162.5 |  |  |  |  |
Adjustments to Contractual Purchase Price for Working Capital Settlement |  |  |  |  |  |  | $ 2.5
Adjustments to Contractual Purchase Price for Capital Equipment |  |  |  |  |  |  | 4.9
Adjustment to Contractual Purchase Price - Existing Payable Balance |  |  |  |  |  |  | (22.8)
Cash and cash equivalents acquired |  |  |  |  |  |  | (0.5)
Accounts receivable |  |  |  |  |  |  | 1.1
Inventories |  |  |  |  |  |  | 4.8
Prepaid expenses and other long-term assets |  |  |  |  |  |  | 3.6
Property, plant and equipment |  |  |  |  |  |  | 38.4
Intangible assets |  |  |  |  |  |  | 31.7
Total assets acquired |  |  |  |  |  |  | 79.6
Accounts payable |  |  |  |  |  |  | 10.8
Accrued expenses and other |  |  |  |  |  |  | 2.7
Deferred income tax liabilities |  |  |  |  |  |  | 1.2
Adjusted purchase price, net of cash acquired |  | $ 146.6 |  |  |  |  |
Net assets acquired |  |  |  |  |  |  | 64.9
Goodwill |  |  |  |  |  |  | $ 81.7
Percentage of equity interests acquired |  |  |  |  |  |  | 100.00%

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