|
Retirement Benefits - Obligations and Funded Status (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Changes in plan assets [Roll Forward] | ||
| Employer contributions | $ 0 | |
| US Plans [Member] | ||
| Changes in the benefit obligation [Roll Forward] | ||
| Service cost | 0 | 0 |
| Interest cost | 9.0 | 11.4 |
| Non-US Plans [Member] | ||
| Changes in the benefit obligation [Roll Forward] | ||
| Service cost | 2.9 | 3.5 |
| Interest cost | 3.2 | 5.8 |
| UMWA Plans Postretirement Medical [Member] | ||
| Changes in the benefit obligation [Roll Forward] | ||
| Service cost | 0 | 0 |
| Interest cost | 4.5 | 4.8 |
| Pension plan [Member] | ||
| Changes in the benefit obligation [Roll Forward] | ||
| Service cost | 2.9 | 3.5 |
| Interest cost | 12.2 | 17.2 |
| Retirement benefits other than pension [Member] | ||
| Changes in the benefit obligation [Roll Forward] | ||
| Service cost | 0 | 0 |
| Interest cost | $ 5.2 | $ 5.4 |