Retirement Benefits - Information comparing plan asssets to obligatoins (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
US Plans [Member]
|
Dec. 31, 2010
US Plans [Member]
|
Dec. 31, 2011
Non-US Plans [Member]
|
Dec. 31, 2009
Non-US Plans [Member]
|
Dec. 31, 2011
Pension plan [Member]
|
Dec. 31, 2010
Pension plan [Member]
|
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Pension plans with an accumulated benefit obligation in excess of plan assets [Abstract] | ||||||
Fair value of plan assets | $ 685.4 | $ 698.4 | $ 117.5 | $ 24.1 | $ 802.9 | $ 722.5 |
Accumulated benefit obligation | 990.7 | 890.1 | 179.8 | 78.1 | 1,170.5 | 968.2 |
Projected benefit obligation | $ 990.7 | $ 890.1 | $ 206.4 | $ 95.0 | $ 1,197.1 | $ 985.1 |