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Retirement Benefits - Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Net asset value per share practical expedient(a) $ 15.7 $ 1.4  
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 164.8 179.3 $ 322.0
Non-U.S. Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 149.1 $ 177.9