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Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance $ (416.6) $ (370.3) $ (250.0) $ (245.4) $ (370.3) $ (245.4)
Amounts reclassified from accumulated other comprehensive loss 1.7   (0.2)   2.3 (4.9)
Other comprehensive income (loss) 6.2 (31.2) (2.5) 1.6 (25.0) (0.9)
Ending Balance (465.9) (416.6) (270.8) (250.0) (465.9) (270.8)
Changes in Fair Value of Derivatives            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance   1.0     1.0  
Other comprehensive (loss) income before reclassifications         (14.1)  
Amounts reclassified from accumulated other comprehensive loss 1.0       0.8  
Other comprehensive income (loss) (1.3)       (13.3)  
Ending Balance (12.3)       (12.3)  
Pension and OPEB Cost            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance   (185.7)   (155.2) (185.7) (155.2)
Amounts reclassified from accumulated other comprehensive loss         1.5 (0.4)
Other comprehensive income (loss) 0.7   (0.2)   1.5 (0.4)
Ending Balance (184.2)   (155.6)   (184.2) (155.6)
Translation Adjustments            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance   8.5   1.4 8.5 1.4
Other comprehensive (loss) income before reclassifications         (13.0) 2.4
Amounts reclassified from accumulated other comprehensive loss           (4.5)
Other comprehensive income (loss)         (13.0) (2.1)
Ending Balance (4.5)   (0.7)   (4.5) (0.7)
Other            
Accumulated Other Comprehensive Income Loss [Line Items]            
Other comprehensive (loss) income before reclassifications           1.5
Other comprehensive income (loss)     0.9     1.5
Ending Balance     1.5     1.5
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance (207.2) (176.2) (152.4) (153.8) (176.2) (153.8)
Other comprehensive (loss) income before reclassifications         (27.1) 3.9
Amounts reclassified from accumulated other comprehensive loss         2.3 (4.9)
Other comprehensive income (loss) 6.2 (31.0) (2.4) 1.4 (24.8) (1.0)
Ending Balance $ (201.0) $ (207.2) $ (154.8) $ (152.4) $ (201.0) $ (154.8)