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Pension and Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Defined Benefit Plan [Abstract]  
Summary of Pension and Postretirement Benefit Plans' Change in Benefit Obligation, Plan Assets and Funded Status
The following table sets forth information regarding the pension and postretirement benefit plans’ change in benefit obligation, plan assets and funded status at December 31, 2018 and 2017:
($ millions)PensionPostretirement
2018201720182017
Change in benefit obligation:
Benefit obligation at beginning of year$468.0 $437.6 $28.3 $28.9 
Service cost7.7 8.7 — — 
Interest cost16.0 17.1 0.9 1.1 
Actuarial (gain) loss(43.6)26.1 (1.3)1.0 
Benefits paid(20.0)(21.5)(2.4)(2.7)
Benefit obligation at end of year428.1 468.0 25.5 28.3 
Change in plan assets available for plan benefits:
Fair value of plan assets available for plan benefits at beginning of year407.7 362.7 — — 
Employer contribution15.0 15.0 — — 
Actual return on plan assets(21.1)51.5 — — 
Benefits paid(20.0)(21.5)— — 
Fair value of plan assets at end of year$381.6 $407.7 $— $— 
Supplemental executive retirement plan(11.0)(10.7)— — 
Funded status at end of year$(57.5)$(71.0)$(25.5)$(28.3)
Accumulated benefit obligation end of year$406.5 $442.9 
Company's Share of Amounts Included in Accumulated Other Comprehensive Income (Loss)
The following table sets forth the amounts included in accumulated other comprehensive (loss) income that has not been recognized in net periodic cost at December 31, 2018 and 2017:
($ millions)20182017
Prior service benefit$(49.7)$(56.1)
Net actuarial loss160.8 169.7 
Total$111.1 $113.6 
Company's Share of Amortization Expected to be Recognized
The following table sets forth the Company’s share of amortization expected to be recognized as a component of net periodic cost for the year ending December 31, 2019:
($ millions)2019
Prior service benefit$(5.5)
Net actuarial loss6.0 
Total$0.5 
Company's Share of Net Periodic Cost Components
The following table sets forth information regarding the Company’s share of pension and postretirement benefit plans’ components of net periodic cost for the years ended December 31, 2018, 2017 and 2016:
($ millions)PensionPostretirement
201820172016201820172016
Components of net periodic cost:
Service cost$5.1 $5.7 $6.2 $— $— $— 
Interest cost10.7 11.4 11.9 0.6 0.8 0.9 
Expected return on plan assets(18.0)(16.7)(15.1)— — — 
Amortization of:
Prior service benefit— — — (5.5)(5.5)(5.5)
Net actuarial loss8.2 7.8 9.2 0.3 0.2 0.2 
Net periodic cost (benefit)$6.0 $8.2 $12.2 $(4.6)$(4.5)$(4.4)
Company's Share of Expected Future Benefits Payments Schedule
The following table sets forth the benefit payments, which reflect expected future service, expected to be paid:
($ millions)PensionPostretirement
2019$17.7 $2.3 
202018.3 2.2 
202118.9 2.1 
202219.7 2.0 
202320.8 1.9 
2024-2028120.3 8.9 
Weighted Average Assumptions Used to Determine Benefit Plans' Obligations
The following table sets forth the weighted average assumptions used to determine the benefit plans’ obligations at December 31, 2018 and 2017:
 PensionPostretirement
  
2018201720182017
Benefit obligations weighted-average assumptions:
Discount rate4.12 %3.50 %4.12 %3.50 %
Rates of increase in compensation levels3.25  3.25  —  —  
Weighted Average Assumptions Used to Determine Benefit Plans' Net Periodic Cost
The following table sets forth the weighted average assumptions used to determine the benefit plans’ net periodic cost for the years ended December 31, 2018, 2017 and 2016:
 Pension Postretirement
  
201820172016 201820172016
Weighted-average assumptions:
Discount rate3.50 %4.00 %4.20 %3.50 %4.00 %4.20 %
Expected long-term rate of return on assets7.00  7.00  7.00    —  —  —  
Rates of increase in compensation levels3.25  3.50  3.50    —  —  —  
Schedule of Assumed Health Care Cost Trend Rates Used
The following table sets forth the assumed health care cost trend rates used for the years ended December 31, 2018, 2017 and 2016:
 Postretirement
  
201820172016
Assumed health care cost trend rates:
Health care cost trend rate assumed for the next year5.50 %6.00 %6.50 %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)3.80 %3.80 %3.90 %
Year that the rate reaches the ultimate trend rate207520752075
Summary on Effective Impact of Assumed Health Care Cost Trend Rates on Amounts Reported for Postretirement Plan The following table sets forth the effects of a one percentage point change in assumed health care cost trend rates for the year ended December 31, 2018:
($ millions)Postretirement
  
Increase(Decrease)
One percentage point change:
Effect on total service and interest cost$0.1 $(0.1)
Effect on accumulated postretirement benefit obligation2.2 (1.9)
Summary of Asset Allocation Targets The following table sets forth the asset allocation targets, as a percentage of total fair value, which are used as a guide by management when allocating funds as they become available.
  
Asset
allocation
target
(0 to 100%)
Asset Category:
Fixed maturity52.0 %
U.S. large-cap equity24.2  
U.S. small-cap equity10.3  
International equity9.4  
Emerging market equity4.1  
Total100.0 %
  
Company's Share of Pension Plan's Available-for-Sale Securities
The following tables set forth the plan’s investments within the fair value hierarchy at December 31, 2018 and 2017:
($ millions)Total
Quoted prices
in active
markets for
identical
assets
(Level 1)
Significant
other
observable
inputs
(Level 2)
December 31, 2018
Fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies$90.6 $— $90.6 
Corporate securities121.4 — 121.4 
U.S. government agencies mortgage-backed securities5.2 — 5.2 
Total fixed maturities217.2 — 217.2 
Equity securities:
Large-cap securities82.3 82.3 — 
Mutual and exchange traded funds43.4 43.4 — 
Total equity securities125.7 125.7 — 
Total pension plan investments$342.9 $125.7 $217.2 

($ millions)Total
Quoted prices
in active
markets for
identical
assets
(Level 1)
Significant
other
observable
inputs
(Level 2)
December 31, 2017
Fixed maturities:
U.S. treasury securities and obligations of U.S. government agencies$107.9 $— $107.9 
Corporate securities93.4 — 93.4 
U.S. government agencies mortgage-backed securities6.7 — 6.7 
Total fixed maturities208.0 — 208.0 
Equity securities:
Large-cap securities110.1 110.1 — 
Small-cap securities38.6 38.6 — 
Total equity securities148.7 148.7 — 
Total pension plan investments$356.7 $148.7 $208.0