Retirement Benefit Plans Retirement Benefit Plans - Funded status of plans with ABO in excess of plan assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	$ 757.7	$ 656.9
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	458.0	435.5
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Deficiency	299.7	221.4
United States Pension Deficiency [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Deficiency	47.4	47.0
United Kingdom Pension Deficiency [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Deficiency	22.4	13.4
Germany Pension Deficiency [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Deficiency	192.4	128.7
Other Countries Pension Deficiency [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Deficiency	$ 37.5	$ 32.3