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Long-Term Debt Notes Payable (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Payments of Debt Issuance Costs | $ 6.9 | $ 91.0 | $ 0.0 |  |  |
Other expense - Debt refinancing and redemption costs | 19.4 | 3.5 | 0.0 |  |  |
Repayments of Long-term Debt | $ 681.2 | 2,154.4 | $ 7.0 |  |  |
7.75% Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.75% |  |  |  |  |
6.625% Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.625% |  |
6.25% Notes Due 2025 & 6.50% Notes Due 2027 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Payments of Debt Issuance Costs |  | 37.2 |  |  |  |
6.25% Notes Due 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Payments of Debt Issuance Costs | $ 6.6 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.25% |
6.25% Notes due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.25% |
Secured Debt [Member] | Term Loan A [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 83.8 | 92.5 |  |  |  |
Secured Debt [Member] | Term Loan B [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 1,511.2 | 1,526.8 |  |  |  |
Unsecured Debt [Member] | 7.75% Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 100.0 | 200.0 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.75% |  |  |  |  |
Debt Instrument, Repurchase Amount | $ 100.0 |  |  |  |  |
Write off of Deferred Debt Issuance Cost | 0.3 |  |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 3.9 |  |  |  |  |
Redemption Premium | 4.5 |  |  |  |  |
Unsecured Debt [Member] | 6.625% Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 450.0 | 550.0 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  | $ 100.0 |  |
Write off of Deferred Debt Issuance Cost | $ 0.8 |  |  |  |  |
Interest Paid, Including Capitalized Interest, Operating and Investing Activities | 0.8 |  |  |  |  |
Redemption Premium | 3.3 |  |  |  |  |
Unsecured Debt [Member] | 6.50% Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 500.0 | 500.0 |  |  |  | $ 500.0
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |  |  |  | 6.50%
Unsecured Debt [Member] | 6.25% Notes Due 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 400.0 | 0.0 |  |  | $ 400.0 |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |  |  |  |
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 700.0 | 700.0 |  |  |  | $ 700.0
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |  |  |  | 6.25%
Unsecured Debt [Member] | 6.25% Notes due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 0.0 | 400.0 |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  | $ 400.0 |
Write off of Deferred Debt Issuance Cost | 2.5 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost | $ 8.0 |  |  |  |  |
Metaldyne Performance Group, Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | 2.7 |  |  |  |
Proceeds from Notes Payable |  | $ 1,200.0 |  |  |  |
Metaldyne Performance Group, Inc. [Member] | Unsecured Debt [Member] | 6.50% Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 500.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.50%
Metaldyne Performance Group, Inc. [Member] | Unsecured Debt [Member] | 6.25% Notes due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 700.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.25%

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