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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) $ (60.0) $ (48.8)  
Beginning balance 1,128.7 1,208.3 $ 651.1
Other comprehensive income (loss) before reclassifications, net of taxes (14.6) 1.3 (3.9)
Amounts reclassified from accumulated other comprehensive loss, net of taxes 3.4 1.8 3.4
Ending balance 1,096.1 1,128.7 1,208.3
Other comprehensive income (loss) before reclassifications, tax 0.0 0.0 0.0
Reclassification from AOCI, Current Period, Tax 0.0 0.0 0.0
Impact of adoption of new accounting standards      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (4.1)   (1.4)
Ending balance   (4.1)  
Accumulated Other Compre- hensive Income (Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (48.8) (51.9) (42.3)
Impact of adoption of ASU 2018-02     (9.1)
Ending balance (60.0) (48.8) (51.9)
Accumulated Other Compre- hensive Income (Loss) | Impact of adoption of new accounting standards      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 0.0   (9.1)
Ending balance   0.0  
Employee Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (48.0) (55.2) (44.2)
Other comprehensive income (loss) before reclassifications, net of taxes (7.7) 5.3 (4.9)
Amounts reclassified from accumulated other comprehensive loss, net of taxes 2.4 1.9 3.4
Impact of adoption of ASU 2018-02     (9.5)
Ending balance (53.3) (48.0) (55.2)
Employee Benefit Plans | Pension Benefits      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) (53.3) (48.0)  
Employee Benefit Plans | Qualified Plans | Pension Benefits      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) (48.9) (47.4)  
Employee Benefit Plans | Qualified Plans | Post-retirement plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) (3.6) 0.2  
Employee Benefit Plans | Non-qualified Plan | Pension Benefits      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) (0.8) (0.8)  
Interest Rate Swap      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) (6.7) (0.8)  
Beginning balance (0.8) 3.3 1.9
Other comprehensive income (loss) before reclassifications, net of taxes (6.9) (4.0) 1.0
Amounts reclassified from accumulated other comprehensive loss, net of taxes 1.0 (0.1) 0.0
Impact of adoption of ASU 2018-02     0.4
Ending balance $ (6.7) $ (0.8) $ 3.3