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Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect $ (104.3)   $ (104.8)
Income tax effect 4.6   6.1
Accumulated other comprehensive loss (99.7)   (98.7)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start 762.2 $ 829.6  
Net amount reclassified to net income (loss) 0.3 0.4  
Balance, end 728.1 830.4  
Defined benefit plan and other postretirement liabilities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect (106.7)   (107.3)
Income tax effect (5.1)   (6.6)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start (100.7) (93.8)  
Impact of ASU 2018-02 (1.3)    
Net amount reclassified to net income (loss) 0.3 0.4  
Balance, end (101.7) (93.4)  
Unrealized gain (loss) on financial instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect 2.4   2.5
Income tax effect 0.5   $ 0.5
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start 2.0 2.1  
Impact of ASU 2018-02 0.0    
Net amount reclassified to net income (loss) 0.0 0.0  
Balance, end 2.0 2.1  
Accumulated other comprehensive loss [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start (98.7) (91.7)  
Impact of ASU 2018-02 (1.3)    
Balance, end $ (99.7) $ (91.3)