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Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect $ (110.9)   $ (110.9)   $ (113.6)
Income tax effect 3.3   3.3   3.8
Accumulated other comprehensive loss (107.6)   (107.6)   (109.8)
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, start 673.8 $ 728.1 675.0 $ 762.2  
Impact of ASU 2018-02       1.3  
Balance, end 648.7 709.4 648.7 709.4  
Defined benefit plan and other postretirement liabilities [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Other comprehensive loss before income tax effect (113.1)   (113.1)   (115.9)
Income tax effect (3.7)   (3.7)   (4.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, start (110.3) (101.7) (111.7) (100.7)  
Impact of ASU 2018-02       (1.3)  
Net amount reclassified to net income (loss) 0.8 1.0 2.2 1.3  
Balance, end (109.5) (100.7) (109.5) (100.7)  
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 1.9 2.0  
Impact of ASU 2018-02       0.0  
Net amount reclassified to net income (loss) 0.0 0.0 0.0 (0.1)  
Balance, end 1.9 2.0 1.9 2.0  
Accumulated other comprehensive loss [Member]          
AOCI Attributable to Parent, Net of Tax [Roll Forward]          
Balance, start (108.4) (99.7) (109.8) (98.7)  
Impact of ASU 2018-02       (1.3)  
Net amount reclassified to net income (loss) 0.8 1.0 2.2 1.3  
Balance, end $ (107.6) $ (98.7) $ (107.6) $ (98.7)