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Employee Retirement Plans (Net Pension Income) (Details) - Pension income [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Interest cost $ (4.3) $ (5.1)
Expected return on plan assets 6.9 7.9
Net pension income $ 2.6 $ 2.8