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Significant Accounting Policies (Recently Adopted Accounting Standards) (Details) - USD ($) $ in Millions | Jan. 01, 2018 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Balance Sheet |  |  |  |  |  |
Property, plant and equipment, net |  | $ 267.1 | [1] | $ 262.8 | $ 263.7 | [1]
Right of use asset, leases |  | 101.9 |  | 90.9 | 0.0 |
Current portion of long-term debt |  | 29.5 |  | 39.4 | 39.5 |
Operating Lease, Liability, Current |  | 21.8 |  | 24.1 | 0.0 |
Long-term debt, net |  | 777.2 |  | 842.9 | 843.0 |
Long-term lease liabilities |  | 89.8 |  | 76.6 | 11.0 |
Accumulated deficit |  | (574.2) |  | (656.3) | $ (656.8) |
Calculated under Lease Guidance in Effect before Topic 842 |  |  |  |  |  |
Balance Sheet |  |  |  |  |  |
Property, plant and equipment, net |  | 267.9 |  |  |  |
Right of use asset, leases |  | 0.0 |  |  |  |
Current portion of long-term debt |  | 29.6 |  |  |  |
Operating Lease, Liability, Current |  | 0.2 |  |  |  |
Long-term debt, net |  | 777.4 |  |  |  |
Long-term lease liabilities |  | 10.5 |  |  |  |
Accumulated deficit |  | (574.7) |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Balance Sheet |  |  |  |  |  |
Property, plant and equipment, net |  |  |  | (0.9) |  |
Right of use asset, leases |  |  |  | 90.9 |  |
Current portion of long-term debt |  |  |  | (0.1) |  |
Operating Lease, Liability, Current |  |  |  | 24.1 |  |
Long-term debt, net |  |  |  | (0.1) |  |
Long-term lease liabilities |  |  |  | 65.6 |  |
Accumulated deficit |  |  |  | $ 0.5 |  |
Accounting Standards Update 2016-02 | Difference between Lease Guidance in Effect before and after Topic 842 |  |  |  |  |  |
Balance Sheet |  |  |  |  |  |
Property, plant and equipment, net |  | (0.8) |  |  |  |
Right of use asset, leases |  | 101.9 |  |  |  |
Current portion of long-term debt |  | (0.1) |  |  |  |
Operating Lease, Liability, Current |  | 21.6 |  |  |  |
Long-term debt, net |  | (0.2) |  |  |  |
Long-term lease liabilities |  | 79.3 |  |  |  |
Accumulated deficit |  | $ 0.5 |  |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |
Balance Sheet |  |  |  |  |  |
Cumulative effect on retained earnings, net of tax, upon adoption of new accounting standard | $ 1.6 |  |  |  |  |
[1] | Net property, plant and equipment as of December 31, 2019 and 2018 contained $68.5 million and $51.9 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Depreciation expense for software was $8.9 million, $8.2 million and $7.1 million for the years ended December 31, 2019, 2018 and 2017, respectively.

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