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Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect $ (109.5)     $ (109.5)   $ (113.6)
Income tax effect 3.0     3.0   3.8
Accumulated other comprehensive loss (106.5)     (106.5)   (109.8)
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, start 648.7 $ 709.4 $ 762.2 675.0 $ 762.2  
Impact of ASU 2018-02     1.3   (1.3)  
Net amount reclassified to net income (loss) 1.1 0.7   3.3 2.0  
Balance, end 592.4 689.9   592.4 689.9  
Defined benefit plan and other postretirement liabilities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect (111.7)     (111.7)   (115.9)
Income tax effect (3.4)     (3.4)   (4.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, start (109.5) (100.7) (100.7) (111.7) (100.7)  
Impact of ASU 2018-02         (1.3)  
Net amount reclassified to net income (loss) 1.2 0.7   3.4 2.1  
Balance, end (108.3) (100.0)   (108.3) (100.0)  
Unrealized gain (loss) on financial instruments [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other comprehensive loss before income tax effect 2.2     2.2   2.3
Income tax effect 0.4     0.4   $ 0.4
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, start 1.9 2.0 2.0 1.9 2.0  
Impact of ASU 2018-02         0.0  
Net amount reclassified to net income (loss) (0.1) 0.0   (0.1) (0.1)  
Balance, end 1.8 2.0   1.8 2.0  
Accumulated other comprehensive loss [Member]            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Balance, start (107.6) (98.7) $ (98.7) (109.8) (98.7)  
Balance, end $ (106.5) $ (98.0)   $ (106.5) $ (98.0)