Employee Benefit Plans UK Pension Assets, Fair Value Measurement by Input Level (Details) - Pension Benefits, Non U.S. Plans - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans
Diversified Growth Assets	$ 156.3	$ 167.6
Fixed Interest and Index-linked Securities	67.5	78.0
Cash Equivalents	7.7	0.7
Fair Value of Plan Assets	231.5	246.3	$ 225.7
Fair Value, Inputs, Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans
Diversified Growth Assets	0.0	0.0
Fixed Interest and Index-linked Securities	62.2	78.0
Cash Equivalents	7.7	0.7
Fair Value of Plan Assets	69.9	78.7
Fair Value, Inputs, Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans
Diversified Growth Assets	156.3	167.6
Fixed Interest and Index-linked Securities	5.3	0.0
Cash Equivalents	0.0	0.0
Fair Value of Plan Assets	161.6	167.6
Fair Value, Inputs, Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans
Diversified Growth Assets	0.0	0.0
Fixed Interest and Index-linked Securities	0.0	0.0
Cash Equivalents	0.0	0.0
Fair Value of Plan Assets	$ 0.0	$ 0.0