Supplemental Guarantor Information (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 |
Current assets: | | | | | | |
Cash and cash equivalents | $ 36.5 | | $ 46.6 | | | |
Accounts receivable, net | 288.4 | | 264.4 | | | |
Inventories, net | 329.8 | | 317.8 | | | |
Receivable from affiliates | 24.8 | | 22.3 | | | |
Prepaid and other current assets | 79.3 | | 82.2 | | | |
Total current assets | 758.8 | | 733.3 | | | |
Investments in subsidiaries | 0 | | 0 | | | |
Intercompany advances | 0 | | 0 | | | |
Property, plant and equipment, net | 234.5 | | 221.9 | | | |
Operating lease right-of-use assets | 64.7 | | 0 | | | |
Goodwill | 106.4 | | 103.4 | | | |
Intangible assets, net | 95.4 | | 95.3 | | | |
Other long-term assets | 82.3 | | 69.8 | | | |
Total assets | 1,342.1 | | 1,223.7 | | | |
Current liabilities: | | | | | | |
Trade accounts payable | 183.9 | | 177.8 | | | |
Payable to affiliates | 7.1 | | 7.1 | | | |
Current portion of long-term debt and short-term debt | 17.8 | | 17.9 | | | |
Current portion of operating lease liabilities | 11.9 | | 0 | | | |
Accrued expenses and other | 101 | | 104.4 | | | |
Total current liabilities | 321.7 | | 307.2 | | | |
Long-term liabilities, less current portion: | | | | | | |
Debt | 570.5 | | 547.5 | | | |
Long-term operating lease liabilities | 54.1 | | 0 | | | |
Other long-term liabilities | 57.2 | | 51.1 | | | |
Total long-term liabilities | 681.8 | | 598.6 | | | |
Intercompany advances | 0 | | 0 | | | |
Total Park-Ohio Industries, Inc. and Subsidiaries shareholder's equity | 324.8 | | 304.2 | | | |
Noncontrolling interests | 13.8 | | 13.7 | | | |
Total equity | 338.6 | $ 337.3 | 317.9 | $ 316.1 | $ 312.7 | $ 292 |
Total liabilities and shareholder's equity | 1,342.1 | | 1,223.7 | | | |
Reportable Legal Entities | Parent | | | | | | |
Current assets: | | | | | | |
Cash and cash equivalents | 0 | | 0 | | | |
Accounts receivable, net | 0 | | 0 | | | |
Inventories, net | 0 | | 0 | | | |
Receivable from affiliates | 24.8 | | 22.3 | | | |
Prepaid and other current assets | 1.5 | | 1.1 | | | |
Total current assets | 26.3 | | 23.4 | | | |
Investments in subsidiaries | 612.3 | | 555.9 | | | |
Intercompany advances | 454.5 | | 460.1 | | | |
Property, plant and equipment, net | 5.6 | | 5.8 | | | |
Operating lease right-of-use assets | 4.2 | | | | | |
Goodwill | 0 | | 0 | | | |
Intangible assets, net | 0 | | 0 | | | |
Other long-term assets | 65.3 | | 58 | | | |
Total assets | 1,168.2 | | 1,103.2 | | | |
Current liabilities: | | | | | | |
Trade accounts payable | 1 | | 0 | | | |
Payable to affiliates | 0 | | 0 | | | |
Current portion of long-term debt and short-term debt | 0 | | 0 | | | |
Current portion of operating lease liabilities | 0.7 | | | | | |
Accrued expenses and other | 5.4 | | 7.3 | | | |
Total current liabilities | 7.1 | | 7.3 | | | |
Long-term liabilities, less current portion: | | | | | | |
Debt | 517.9 | | 488.9 | | | |
Long-term operating lease liabilities | 3.5 | | | | | |
Other long-term liabilities | 21.4 | | 20.9 | | | |
Total long-term liabilities | 542.8 | | 509.8 | | | |
Intercompany advances | 279.7 | | 268.2 | | | |
Total Park-Ohio Industries, Inc. and Subsidiaries shareholder's equity | 324.8 | | 304.2 | | | |
Noncontrolling interests | 13.8 | | 13.7 | | | |
Total equity | 338.6 | | 317.9 | | | |
Total liabilities and shareholder's equity | 1,168.2 | | 1,103.2 | | | |
Reportable Legal Entities | Combined Guarantor Subsidiaries | | | | | | |
Current assets: | | | | | | |
Cash and cash equivalents | 0.8 | | 0.4 | | | |
Accounts receivable, net | 191.7 | | 170 | | | |
Inventories, net | 241.8 | | 236.7 | | | |
Receivable from affiliates | 0 | | 0 | | | |
Prepaid and other current assets | 40.7 | | 46.5 | | | |
Total current assets | 475 | | 453.6 | | | |
Investments in subsidiaries | 264.2 | | 277.7 | | | |
Intercompany advances | 46.4 | | 80.6 | | | |
Property, plant and equipment, net | 138.1 | | 130.6 | | | |
Operating lease right-of-use assets | 36 | | | | | |
Goodwill | 66.4 | | 63.2 | | | |
Intangible assets, net | 59.2 | | 57.8 | | | |
Other long-term assets | 4.4 | | 5.5 | | | |
Total assets | 1,089.7 | | 1,069 | | | |
Current liabilities: | | | | | | |
Trade accounts payable | 128.9 | | 123.6 | | | |
Payable to affiliates | 0 | | 0 | | | |
Current portion of long-term debt and short-term debt | 6.1 | | 6.2 | | | |
Current portion of operating lease liabilities | 7.8 | | | | | |
Accrued expenses and other | 56.2 | | 56.1 | | | |
Total current liabilities | 199 | | 185.9 | | | |
Long-term liabilities, less current portion: | | | | | | |
Debt | 11.3 | | 14.3 | | | |
Long-term operating lease liabilities | 30.9 | | | | | |
Other long-term liabilities | 25.2 | | 19 | | | |
Total long-term liabilities | 67.4 | | 33.3 | | | |
Intercompany advances | 246.1 | | 327 | | | |
Total Park-Ohio Industries, Inc. and Subsidiaries shareholder's equity | 577.2 | | 522.8 | | | |
Noncontrolling interests | 0 | | 0 | | | |
Total equity | 577.2 | | 522.8 | | | |
Total liabilities and shareholder's equity | 1,089.7 | | 1,069 | | | |
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries | | | | | | |
Current assets: | | | | | | |
Cash and cash equivalents | 35.7 | | 46.2 | | | |
Accounts receivable, net | 96.7 | | 94.4 | | | |
Inventories, net | 88 | | 81.1 | | | |
Receivable from affiliates | 0 | | 0 | | | |
Prepaid and other current assets | 37.1 | | 34.6 | | | |
Total current assets | 257.5 | | 256.3 | | | |
Investments in subsidiaries | 0 | | 0 | | | |
Intercompany advances | 164.3 | | 236 | | | |
Property, plant and equipment, net | 90.8 | | 85.5 | | | |
Operating lease right-of-use assets | 24.5 | | | | | |
Goodwill | 40 | | 40.2 | | | |
Intangible assets, net | 36.2 | | 37.5 | | | |
Other long-term assets | 12.6 | | 6.3 | | | |
Total assets | 625.9 | | 661.8 | | | |
Current liabilities: | | | | | | |
Trade accounts payable | 54 | | 54.2 | | | |
Payable to affiliates | 7.1 | | 7.1 | | | |
Current portion of long-term debt and short-term debt | 11.7 | | 11.7 | | | |
Current portion of operating lease liabilities | 3.4 | | | | | |
Accrued expenses and other | 39.4 | | 41 | | | |
Total current liabilities | 115.6 | | 114 | | | |
Long-term liabilities, less current portion: | | | | | | |
Debt | 41.3 | | 44.3 | | | |
Long-term operating lease liabilities | 19.7 | | | | | |
Other long-term liabilities | 10.6 | | 11.2 | | | |
Total long-term liabilities | 71.6 | | 55.5 | | | |
Intercompany advances | 139.4 | | 181.5 | | | |
Total Park-Ohio Industries, Inc. and Subsidiaries shareholder's equity | 285.5 | | 297.1 | | | |
Noncontrolling interests | 13.8 | | 13.7 | | | |
Total equity | 299.3 | | 310.8 | | | |
Total liabilities and shareholder's equity | 625.9 | | 661.8 | | | |
Reclassifications/ Eliminations | | | | | | |
Current assets: | | | | | | |
Cash and cash equivalents | 0 | | 0 | | | |
Accounts receivable, net | 0 | | 0 | | | |
Inventories, net | 0 | | 0 | | | |
Receivable from affiliates | 0 | | 0 | | | |
Prepaid and other current assets | 0 | | 0 | | | |
Total current assets | 0 | | 0 | | | |
Investments in subsidiaries | (876.5) | | (833.6) | | | |
Intercompany advances | (665.2) | | (776.7) | | | |
Property, plant and equipment, net | 0 | | 0 | | | |
Operating lease right-of-use assets | 0 | | | | | |
Goodwill | 0 | | 0 | | | |
Intangible assets, net | 0 | | 0 | | | |
Other long-term assets | 0 | | 0 | | | |
Total assets | (1,541.7) | | (1,610.3) | | | |
Current liabilities: | | | | | | |
Trade accounts payable | 0 | | 0 | | | |
Payable to affiliates | 0 | | 0 | | | |
Current portion of long-term debt and short-term debt | 0 | | 0 | | | |
Current portion of operating lease liabilities | 0 | | | | | |
Accrued expenses and other | 0 | | 0 | | | |
Total current liabilities | 0 | | 0 | | | |
Long-term liabilities, less current portion: | | | | | | |
Debt | 0 | | 0 | | | |
Long-term operating lease liabilities | 0 | | | | | |
Other long-term liabilities | 0 | | 0 | | | |
Total long-term liabilities | 0 | | 0 | | | |
Intercompany advances | (665.2) | | (776.7) | | | |
Total Park-Ohio Industries, Inc. and Subsidiaries shareholder's equity | (862.7) | | (819.9) | | | |
Noncontrolling interests | (13.8) | | (13.7) | | | |
Total equity | (876.5) | | (833.6) | | | |
Total liabilities and shareholder's equity | $ (1,541.7) | | $ (1,610.3) | | | |