Amounts Recognized in Statement of Financial Position (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Pension Costs
Defined Benefit Plan Disclosure [Line Items]
Pension and Postretirement Benefits	$ (3.1)	$ (3.4)
Other Assets	5.1	4.0
Accumulated Other Comprehensive Loss (Income)	12.0	19.9
Net amount recognized at end of year	14.0	20.5
Accumulated benefit obligation	62.9	100.0
Nonpension Postretirement Costs
Defined Benefit Plan Disclosure [Line Items]
Pension and Postretirement Benefits	(21.3)	(24.5)
Other Assets	0.0	0.0
Accumulated Other Comprehensive Loss (Income)	0.7	2.7
Net amount recognized at end of year	(20.6)	(21.8)
Accumulated benefit obligation	$ 0.0	$ 0.0