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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.