Employee Benefit Plans Amounts Recognized in Other Comprehensive Income (Details) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 GBP (£)
Pension Benefits, U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Pension Recognized in Balance Sheet, Net of Deferred Tax	$ (385.5)	$ (222.4)
Amortization of Net Actuarial Loss	11.6	5.2	$ 31.7
Non-operating retirement related loss due to settlement	0.0	64.4
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(22.8)	(320.5)
Amortization of Prior Service Cost (Credit)	0.0	0.0	(0.1)
Recognized Net Gain (Loss) Due to Curtailments	0.0	0.0	0.7
Plan Amendments	7.5	0.0
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	1.3	87.8
Pension Recognized in Balance Sheet, Net of Deferred Tax	(387.9)	(385.5)	(222.4)
Pension Benefits, Non U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Pension Recognized in Balance Sheet, Net of Deferred Tax	(25.0)	(26.0)
Amortization of Net Actuarial Loss	0.3	0.4	1.2
Non-operating retirement related loss due to settlement	0.0	0.0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	7.0	1.1
Amortization of Prior Service Cost (Credit)	0.0	0.0	0.0
Recognized Net Gain (Loss) Due to Curtailments	0.0	0.0	(3.7)	£ (2.3)
Plan Amendments	0.0	0.0
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	(1.5)	(0.5)
Pension Recognized in Balance Sheet, Net of Deferred Tax	(19.2)	(25.0)	(26.0)
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans
Pension Recognized in Balance Sheet, Net of Deferred Tax	9.0	18.5
Amortization of Net Actuarial Loss	0.0	0.0	0.0
Non-operating retirement related loss due to settlement	0.0	0.0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	8.8	(12.9)
Amortization of Prior Service Cost (Credit)	(0.3)	(1.7)	(4.9)
Recognized Net Gain (Loss) Due to Curtailments	0.0	0.0	0.0
Plan Amendments	0.0	0.0
Change in Unrecognized Pension and Postretirement Benefit Costs, Tax Expense	(3.0)	5.1
Pension Recognized in Balance Sheet, Net of Deferred Tax	$ 14.5	$ 9.0	$ 18.5