Retirement Benefits - Narrative (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Net periodic pension cost (credit) [Line Items]
Employer contributions	$ 87.2
Primary U.S. retirement plan [Member]
Retirement Benefit Plan Remeasurements [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 0