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Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Components of Net Periodic Benefit Cost | The components of net periodic benefit cost for the three months ended September 30 were as follows ($ in millions):
| Pension benefits |  | Other retirement benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 2.5 |  |  | $ | 2.3 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 2.5 |  |  | $ | 2.4 |
Interest cost | 2.4 |  |  | 2.7 |  |  | — |  |  | 0.1 |  |  | 2.4 |  |  | 2.8 |
Expected return on assets | (3.4 | ) |  | (3.1 | ) |  | — |  |  | — |  |  | (3.4 | ) |  | (3.1 | )
Amortization of prior service credit | (0.3 | ) |  | (0.3 | ) |  | (0.1 | ) |  | — |  |  | (0.4 | ) |  | (0.3 | )
Recognized actuarial losses (gains) | 1.2 |  |  | 1.3 |  |  | (0.9 | ) |  | (0.3 | ) |  | 0.3 |  |  | 1.0 |
Net periodic benefit cost | $ | 2.4 |  |  | $ | 2.9 |  |  | $ | (1.0 | ) |  | $ | (0.1 | ) |  | $ | 1.4 |  |  | $ | 2.8 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
U.S. plans | $ | 1.7 |  |  | $ | 2.3 |  |  | $ | (1.0 | ) |  | $ | (0.1 | ) |  | $ | 0.7 |  |  | $ | 2.2 |
International plans | 0.7 |  |  | 0.6 |  |  | — |  |  | — |  |  | 0.7 |  |  | 0.6 |
Net periodic benefit cost | $ | 2.4 |  |  | $ | 2.9 |  |  | $ | (1.0 | ) |  | $ | (0.1 | ) |  | $ | 1.4 |  |  | $ | 2.8 |
The components of net periodic benefit cost for the nine months ended September 30 were as follows ($ in millions):
| Pension benefits |  | Other retirement benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 7.8 |  |  | $ | 7.6 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 7.8 |  |  | $ | 8.0 |
Interest cost | 7.3 |  |  | 7.9 |  |  | 0.2 |  |  | 0.3 |  |  | 7.5 |  |  | 8.2 |
Expected return on assets | (10.1 | ) |  | (9.5 | ) |  | — |  |  | — |  |  | (10.1 | ) |  | (9.5 | )
Amortization of transition obligation | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | 0.1 |
Amortization of prior service credit | (1.0 | ) |  | (1.0 | ) |  | (0.5 | ) |  | — |  |  | (1.5 | ) |  | (1.0 | )
Recognized actuarial losses (gains) | 3.6 |  |  | 3.6 |  |  | (2.0 | ) |  | (1.0 | ) |  | 1.6 |  |  | 2.6 |
Net periodic benefit cost | $ | 7.6 |  |  | $ | 8.7 |  |  | $ | (2.3 | ) |  | $ | (0.3 | ) |  | $ | 5.3 |  |  | $ | 8.4 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
U.S. plans | $ | 5.5 |  |  | $ | 6.9 |  |  | $ | (2.3 | ) |  | $ | (0.3 | ) |  | $ | 3.2 |  |  | $ | 6.6 |
International plans | 2.1 |  |  | 1.8 |  |  | — |  |  | — |  |  | 2.1 |  |  | 1.8 |
Net periodic benefit cost | $ | 7.6 |  |  | $ | 8.7 |  |  | $ | (2.3 | ) |  | $ | (0.3 | ) |  | $ | 5.3 |  |  | $ | 8.4 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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