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Stockholders' Equity - Change in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pension settlement charges $ (6.1) $ 0.0 $ (6.1) $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   (76.9)    
Net current-period other comprehensive (loss) income   (9.8) 15.1 (3.2)
Ending balance (76.9) (97.3) (76.9)  
U.S. Benefit Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pension settlement charges   0.0 (6.1) 0.0
Amortization of actuarial loss   3.0 2.5 5.6
Non-U.S. Benefit Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Pension settlement charges   0.0 0.0 0.0
Amortization of actuarial loss   0.6 0.6 0.6
Actuarial Losses        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance [1]   (75.4) (79.0)  
Other comprehensive (loss) income before reclassifications   (3.9) (2.2) [1]  
Amounts reclassified from accumulated other comprehensive loss   2.7 5.8 [1]  
Net current-period other comprehensive (loss) income   (1.2) 3.6 [1]  
Ending balance (75.4) [1] (87.4) (75.4) [1] (79.0) [1]
Prior Service Costs        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   0.0    
Other comprehensive (loss) income before reclassifications   (2.5)    
Amounts reclassified from accumulated other comprehensive loss   0.0    
Net current-period other comprehensive (loss) income   (2.5)    
Ending balance 0.0 (2.5) 0.0  
Foreign Currency Translation        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   (2.5) (13.0)  
Other comprehensive (loss) income before reclassifications   (6.4) 10.5  
Amounts reclassified from accumulated other comprehensive loss   0.0 0.0  
Net current-period other comprehensive (loss) income   (6.4) 10.5  
Ending balance (2.5) (8.9) (2.5) (13.0)
Unrealized Gain on Derivatives        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   1.0 0.0  
Other comprehensive (loss) income before reclassifications   0.8 0.8  
Amounts reclassified from accumulated other comprehensive loss   (0.5) 0.2  
Net current-period other comprehensive (loss) income   0.3 1.0  
Ending balance 1.0 1.5 1.0 0.0
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   (76.9) (92.0)  
Other comprehensive (loss) income before reclassifications   (12.0) 9.1  
Amounts reclassified from accumulated other comprehensive loss   2.2 6.0  
Net current-period other comprehensive (loss) income   (9.8) 15.1 (3.2)
Ending balance $ (76.9) (97.3) $ (76.9) $ (92.0)
Accounting Standards Update 2018-02        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact of adoption of ASU 2018-02   0.0    
Accounting Standards Update 2018-02 | Actuarial Losses        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact of adoption of ASU 2018-02 [2]   (10.8)    
Accounting Standards Update 2018-02 | Prior Service Costs        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact of adoption of ASU 2018-02 [2]   0.0    
Accounting Standards Update 2018-02 | Foreign Currency Translation        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact of adoption of ASU 2018-02 [2]   0.0    
Accounting Standards Update 2018-02 | Unrealized Gain on Derivatives        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact of adoption of ASU 2018-02 [2]   0.2    
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Impact of adoption of ASU 2018-02 [2]   $ (10.6)    
[1] During the year ended December 31, 2017, the Company reclassified $6.1 million of actuarial losses from Accumulated other comprehensive loss to Pension settlement charges on the Consolidated Statements of Operations.
[2] Refer to Note 1– Summary of Significant Accounting Policies for further discussion of the adoption of ASU 2018-02.