Pension Plans and Other Postretirement Benefit Plans - Pension Plans and Other Postretirement Benefit (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Funded status of fully funded, underfunded, and unfunded pension plans:
Overfunded defined benefit pension plans	$ 0.4	$ 0.0
Underfunded and unfunded defined benefit pension plans	379.0	377.5
Pension liabilities included in other current liabilities	14.3	14.2
Defined Benefit Pension Plan, Liabilities	393.3
Net funded status	(392.9)	(391.7)
Underfunded defined benefit pension plans [Member]
Funded status of fully funded, underfunded, and unfunded pension plans:
Underfunded and unfunded defined benefit pension plans	70.3	73.2
Unfunded defined benefit pension plans [Member]
Funded status of fully funded, underfunded, and unfunded pension plans:
Underfunded and unfunded defined benefit pension plans	$ 308.7	$ 304.3