Pension and Other Post-Retirement Benefits (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Pension [Member]
Components of pension and other post retirement benefit costs
Service cost	$ 1.6	$ 1.5	$ 4.9	$ 4.5