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Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect $ (111.9)   $ (113.6)
Income tax effect 3.5   3.8
Accumulated other comprehensive loss (108.4)   (109.8)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start 675.0 $ 762.2  
Balance, end 673.8 728.1  
Defined benefit plan and other postretirement liabilities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect (114.2)   (115.9)
Income tax effect (4.0)   (4.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start (111.7) (100.7)  
Impact of ASU 2018-02   (1.3)  
Net amount reclassified to net income (loss) 1.4 0.3  
Balance, end (110.3) (101.7)  
Unrealized gain (loss) on financial instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss before income tax effect 2.3   2.3
Income tax effect 0.5   $ 0.4
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start 1.9 2.0  
Impact of ASU 2018-02   0.0  
Net amount reclassified to net income (loss) (0.0) (0.0)  
Balance, end 1.9 2.0  
Accumulated other comprehensive loss [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, start (109.8) (98.7)  
Impact of ASU 2018-02   (1.3)  
Net amount reclassified to net income (loss) 1.4 0.3  
Balance, end $ (108.4) $ (99.7)