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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of Components of Net Periodic Benefit Cost | The components of net periodic benefit cost and other amounts recognized in other comprehensive income were as follows:
| Pension benefits |  | Other retirement benefits
($ in millions) | 2015 |  | 2014 |  | 2013 |  |  | 2015 |  | 2014 |  | 2013 |
Net periodic benefit cost: |  |  |  |  |  |  |
Service cost | $ | 10.6 |  | $ | 9.8 |  | $ | 9.7 |  |  | $ | 0.5 |  | $ | 0.4 |  | $ | 1.1 |
Interest cost | 13.8 |  | 17.1 |  | 14.8 |  |  | 0.4 |  | 0.4 |  | 0.6 |
Expected return on assets | (19.5 | ) | (19.3 | ) | (17.3 | ) |  | — |  | — |  | — |
Amortization of prior service credit | (1.3 | ) | (1.3 | ) | (1.3 | ) |  | — |  | — |  | — |
Amortization of transition obligation | 0.1 |  | 0.1 |  | 0.1 |  |  | — |  | — |  | — |
Amortization of actuarial loss (gain) | 5.9 |  | 4.7 |  | 9.2 |  |  | (1.4 | ) | (1.6 | ) | (0.7 | )
Settlement effects | 50.4 |  | — |  | — |  |  | — |  | — |  | — |
Net periodic benefit cost | $ | 60.0 |  | $ | 11.1 |  | $ | 15.2 |  |  | $ | (0.5 | ) | $ | (0.8 | ) | $ | 1.0 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income, pre-tax: |  |  |  |  |  |  |
Net loss (gain) arising during period | $ | 17.7 |  | $ | 31.5 |  | $ | (36.1 | ) |  | $ | (0.8 | ) | $ | 0.1 |  | $ | (18.5 | )
Prior service credit arising during period | (0.7 | ) | — |  | — |  |  | — |  | — |  | — |
Amortization of prior service credit | 1.3 |  | 1.3 |  | 1.3 |  |  | — |  | — |  | — |
Amortization of transition obligation | (0.1 | ) | (0.1 | ) | (0.1 | ) |  | — |  | — |  | — |
Amortization of actuarial (loss) gain | (5.9 | ) | (4.7 | ) | (9.2 | ) |  | 1.4 |  | 1.6 |  | 0.7 |
Settlement effects | (50.4 | ) | — |  | — |  |  | — |  | — |  | — |
Foreign currency translation | (1.6 | ) | (2.1 | ) | 0.6 |  |  | — |  | — |  | — |
Total recognized in other comprehensive income | $ | (39.7 | ) | $ | 25.9 |  | $ | (43.5 | ) |  | $ | 0.6 |  | $ | 1.7 |  | $ | (17.8 | )
Total recognized in net periodic benefit cost and other comprehensive income | $ | 20.3 |  | $ | 37.0 |  | $ | (28.3 | ) |  | $ | 0.1 |  | $ | 0.9 |  | $ | (16.8 | )
Net periodic benefit cost by geographic location is as follows:
| Pension benefits |  | Other retirement benefits
| 2015 |  | 2014 |  | 2013 |  |  | 2015 |  | 2014 |  | 2013 |
U.S. plans | $ | 57.4 |  | $ | 8.1 |  | $ | 11.9 |  |  | $ | (0.5 | ) | $ | (0.8 | ) | $ | 1.0 |
International plans | 2.6 |  | 3.0 |  | 3.3 |  |  | — |  | — |  | — |
Net periodic benefit cost | $ | 60.0 |  | $ | 11.1 |  | $ | 15.2 |  |  | $ | (0.5 | ) | $ | (0.8 | ) | $ | 1.0 |
Schedule of Changes in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status | The following table presents the changes in the benefit obligation and the fair value of plan assets, as well as the funded status of the plans:
| Pension benefits |  | Other retirement benefits
($ in millions) | 2015 |  | 2014 |  |  | 2015 |  | 2014 |
Change in benefit obligation: |  |  |  |  |
Benefit obligation, January 1 | $ | (398.5 | ) | $ | (360.8 | ) |  | $ | (10.1 | ) | $ | (9.2 | )
Service cost | (10.6 | ) | (9.8 | ) |  | (0.5 | ) | (0.4 | )
Interest cost | (13.8 | ) | (17.1 | ) |  | (0.4 | ) | (0.4 | )
Participants' contributions | (0.6 | ) | (0.9 | ) |  | (0.6 | ) | (0.6 | )
Actuarial (loss) gain | 7.8 |  | (44.5 | ) |  | 0.8 |  | (0.1 | )
Amendments/transfers in | 0.8 |  | — |  |  | — |  | — |
Benefits/expenses paid | 14.6 |  | 28.8 |  |  | 0.6 |  | 0.6 |
Settlement | 149.7 |  | — |  |  | — |  | — |
Foreign currency translation | 4.3 |  | 5.8 |  |  | — |  | — |
Benefit obligation, December 31 | $ | (246.3 | ) | $ | (398.5 | ) |  | $ | (10.2 | ) | $ | (10.1 | )
Change in plan assets: |  |  |  |  |
Fair value of assets, January 1 | $ | 322.3 |  | $ | 284.7 |  |  | $ | — |  | $ | — |
Actual return on assets | (6.0 | ) | 32.3 |  |  | — |  | — |
Employer contribution | 38.0 |  | 35.4 |  |  | — |  | — |
Participants' contribution | 0.6 |  | 0.9 |  |  | 0.6 |  | 0.6 |
Benefits/expenses paid | (14.6 | ) | (28.8 | ) |  | (0.6 | ) | (0.6 | )
Settlement | (149.7 | ) | — |  |  | — |  | — |
Foreign currency translation | (1.7 | ) | (2.2 | ) |  | — |  | — |
Fair value of assets, December 31 | $ | 188.9 |  | $ | 322.3 |  |  | $ | — |  | $ | — |
Funded status at end of year | $ | (57.4 | ) | $ | (76.2 | ) |  | $ | (10.2 | ) | $ | (10.1 | )
Schedule of Amounts Recognized in Balance Sheet | Amounts recognized in the balance sheet were as follows:
| Pension benefits | Other retirement benefits
($ in millions) | 2015 |  | 2014 |  | 2015 |  | 2014 |
Current liabilities | $ | (5.0 | ) | $ | (1.8 | ) | $ | (0.6 | ) | $ | (0.8 | )
Noncurrent liabilities | (52.4 | ) | (74.4 | ) | (9.6 | ) | (9.3 | )
| $ | (57.4 | ) | $ | (76.2 | ) | $ | (10.2 | ) | $ | (10.1 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) | The amounts in accumulated other comprehensive loss, pre-tax, consisted of:
| Pension benefits | Other retirement benefits
($ in millions) | 2015 |  | 2014 |  | 2015 |  | 2014 |
Net actuarial loss (gain) | $ | 79.9 |  | $ | 120.1 |  | $ | (13.2 | ) | $ | (13.8 | )
Transition obligation | 0.1 |  | 0.2 |  | — |  | — |
Prior service credit | (5.7 | ) | (6.3 | ) | — |  | — |
Total | $ | 74.3 |  | $ | 114.0 |  | $ | (13.2 | ) | $ | (13.8 | )
Schedule of Expected Benefit Payments | Benefit payments expected to be paid under our defined benefit pension and other retirement benefit plans in the next ten years are as follows:
($ in millions) | Domestic | International | Total
2016 | $ | 15.3 |  | $ | 1.5 |  | $ | 16.8 |
2017 | 12.8 |  | 1.7 |  | 14.5 |
2018 | 13.5 |  | 1.9 |  | 15.4 |
2019 | 14.1 |  | 2.2 |  | 16.3 |
2020 | 16.0 |  | 2.8 |  | 18.8 |
2021 to 2025 | 82.9 |  | 14.6 |  | 97.5 |
| $ | 154.6 |  | $ | 24.7 |  | $ | 179.3 |
Schedule of Assumptions Used | Weighted average assumptions used to determine net periodic benefit cost were as follows:
| Pension benefits |  | Other retirement benefits
| 2015 |  | 2014 |  | 2013 |  |  | 2015 |  | 2014 |  | 2013 |
Discount rate | 4.08 | % | 4.50 | % | 3.99 | % |  | 3.90 | % | 4.55 | % | 3.50 | %
Rate of compensation increase | 4.07 | % | 4.29 | % | 4.24 | % |  | — |  | — |  | — |
Long-term rate of return on assets | 6.84 | % | 7.01 | % | 7.12 | % |  | — |  | — |  | — |
Weighted average assumptions used to determine the benefit obligations were as follows:
| Pension benefits |  | Other retirement benefits
| 2015 |  | 2014 |  |  | 2015 |  | 2014 |
Discount rate | 4.22 | % | 3.96 | % |  | 4.30 | % | 3.90 | %
Rate of compensation increase | 4.07 | % | 4.14 | % |  | — |  | — |
Schedule of Allocation of Plan Assets | The weighted average asset allocations by asset category for our pension plans, at December 31, were as follows:
| 2015 |  | 2014 |
Equity securities | 62 | % | 63 | %
Debt securities | 35 | % | 35 | %
Other | 3 | % | 2 | %
| 100 | % | 100 | %
The following are the U.S. target asset allocations and acceptable allocation ranges:
| Target allocation | Allocation range
Equity securities | 65% | 60%-70%
Debt securities | 35% | 30%-40%
Other | —% | 0%-5%
The following tables present the fair value of our pension plan assets, utilizing the fair value hierarchy discussed in Note 10, Fair Value Measurements:
| Balance at |
| December 31, | Basis of Fair Value Measurements
($ in millions) | 2015 | Level 1 | Level 2 | Level 3
Cash | $ | 0.6 |  | $ | 0.6 |  | $ | — |  | $ | — |
Equity securities: |  |  |  |
Indexed mutual funds | 79.2 |  | 79.2 |  | — |  | — |
International mutual funds | 37.7 |  | 37.7 |  | — |  | — |
Fixed income securities: |  |  |  |
Mutual funds | 63.0 |  | 63.0 |  | — |  | — |
Insurance contract | 0.6 |  | — |  | 0.6 |  | — |
Balanced mutual fund | 7.8 |  | 7.8 |  | — |  | — |
| $ | 188.9 |  | $ | 188.3 |  | $ | 0.6 |  | $ | — |
| Balance at |
| December 31, | Basis of Fair Value Measurements
($ in millions) | 2014 | Level 1 | Level 2 | Level 3
Cash | $ | 1.1 |  | $ | 1.1 |  | $ | — |  |
Equity securities: |  |  |  |
Indexed mutual funds | 142.3 |  | 142.3 |  | — |  | — |
International mutual funds | 58.7 |  | 58.7 |  | — |  | — |
Fixed income securities: |  |  |  |
Mutual funds | 111.4 |  | 111.4 |  | — |  | — |
Insurance contract | 1.0 |  | — |  | 1.0 |  | — |
Balanced mutual fund | 7.8 |  | 7.8 |  | — |  | — |
| $ | 322.3 |  | $ | 321.3 |  | $ | 1.0 |  | $ | — |

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