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Stockholders' Equity - Change in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ (97.3)    
Net current-period other comprehensive income (loss) 8.2 $ (9.8) $ 15.1
Ending balance (89.1) (97.3)  
Actuarial Losses      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (87.4) (75.4)  
Other comprehensive income (loss) before reclassifications 4.5 (3.9)  
Amounts reclassified from accumulated other comprehensive loss 2.5 2.7  
Net current-period other comprehensive income (loss) 7.0 (1.2)  
Ending balance (80.4) (87.4) (75.4)
Prior Service Costs      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (2.5) 0.0  
Other comprehensive income (loss) before reclassifications 0.0 (2.5)  
Amounts reclassified from accumulated other comprehensive loss 0.1 0.0  
Net current-period other comprehensive income (loss) 0.1 (2.5)  
Ending balance (2.4) (2.5) 0.0
Foreign Currency Translation      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (8.9) (2.5)  
Other comprehensive income (loss) before reclassifications 1.8 (6.4)  
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0  
Net current-period other comprehensive income (loss) 1.8 (6.4)  
Ending balance (7.1) (8.9) (2.5)
Unrealized Gain on Derivatives      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 1.5 1.0  
Other comprehensive income (loss) before reclassifications 0.0 0.8  
Amounts reclassified from accumulated other comprehensive loss (0.7) (0.5)  
Net current-period other comprehensive income (loss) (0.7) 0.3  
Ending balance 0.8 1.5 1.0
Accumulated Other Comprehensive Loss      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (97.3) (76.9)  
Other comprehensive income (loss) before reclassifications 6.3 (12.0)  
Amounts reclassified from accumulated other comprehensive loss 1.9 2.2  
Net current-period other comprehensive income (loss) 8.2 (9.8) 15.1
Ending balance $ (89.1) (97.3) $ (76.9)
Accounting Standards Update 2018-02 | Actuarial Losses      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Impact of adoption of ASU 2018-02 [1]   (10.8)  
Accounting Standards Update 2018-02 | Prior Service Costs      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Impact of adoption of ASU 2018-02 [1]   0.0  
Accounting Standards Update 2018-02 | Foreign Currency Translation      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Impact of adoption of ASU 2018-02 [1]   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 [1]   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 [1]   $ (10.6)  
[1]
In February 2018, the FASB issued ASU No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, that permits entities to reclassify tax effects stranded in accumulated other comprehensive income (loss) as a result of the 2017 Tax Act to retained earnings. Upon adopting ASU 2018-02 during the fourth quarter of 2018, the Company recorded an adjustment to reclassify the stranded tax effects resulting from the 2017 Tax Act. The reclassification adjustment of $10.6 million resulted in an increase of Retained earnings and Accumulated other comprehensive loss on the Company’s Consolidated Balance Sheet.