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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Accounts Receivable, before Allowance for Credit Loss | $ 139.0 | $ 149.6 |
Accounts Receivable, Allowance for Credit Loss, Current | (1.6) | (1.5) |
Unbilled Receivables, Current | 5.1 | 7.4 |
Income Taxes Receivable, Current | 16.0 | 0.3 |
Other Receivables, Net, Current | 2.1 | 2.6 |
Receivables, net of allowance for current expected credit losses of $1.6 and $1.5 at December 31, 2020 and 2019 | 160.6 | 159.4 |
Interest Receivable, Current | 0.0 | 1.0 |
Interest Costs Capitalized | 0.0 | 5.9 | $ 9.0
Sale of Accounts Receivable | 256.2 | 159.3 |
Factoring Expense | 1.2 | 1.0 |
Inventory, Raw Materials, Gross | 17.2 | 19.4 |
Other Inventory, Gross [Abstract] | 11.5 | 20.1 |
Inventory, Finished Goods, Gross | 137.0 | 148.7 |
Other Inventory, Supplies, Gross | 97.7 | 93.1 |
Depreciation | 107.8 | 108.4 | 94.4
Asset Retirement Obligation | 3.8 | 1.1 | $ 0.4
Accretion Expense, Including Asset Retirement Obligations | 0.1 | 0.0 |
Asset Retirement Obligation, Accretion Expense | 0.1 | 0.1 |
Increase (Decrease) in Asset Retirement Obligations | 2.5 | 0.6 |
Asset Retirement Obligation, Cash Paid to Settle | $ 0.0 | $ 0.0 |

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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