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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Expense (Income) [Table Text Block]
 PensionOther
Postretirement
Components of Net Periodic Benefit Cost (Credit)2022202120222021
Millions    
Quarter Ended June 30,    
Service Cost$2.4 $2.8 $0.7 $0.9 
Non-Service Cost Components (a)
Interest Cost6.8 6.2 1.1 1.1 
Expected Return on Plan Assets(10.3)(10.9)(2.4)(2.5)
Amortization of Prior Service Credits(0.1)(0.1)(1.9)(1.9)
Amortization of Net Loss2.6 4.7 0.1 0.8 
Net Periodic Benefit Cost (Credit)$1.4 $2.7 $(2.4)$(1.6)
Six Months Ended June 30,
Service Cost$4.8 $5.5 $1.5 $1.8 
Non-Service Cost Components (a)
Interest Cost 13.5 12.3 2.2 2.2 
Expected Return on Plan Assets (20.7)(21.7)(4.8)(4.9)
Amortization of Prior Service Credits (0.1)(0.1)(3.8)(3.8)
Amortization of Net Loss5.8 9.4 0.2 1.5 
Net Periodic Benefit Cost (Credit)$3.3 $5.4 $(4.7)$(3.2)
(a)These components of net periodic benefit cost (credit) are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.