Supplemental Accumulated Other Comprehensive Loss Information (Details 1) (Defined Benefit Plans, USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior service benefit	$ (1.4)	[1],[2]	$ (1.4)	[1],[2]	$ (4.2)	[1],[2]	$ (4.3)	[1],[2]
Actuarial loss	0.4	[1],[2]	0.7	[1],[2]	1.1	[1],[2]	1.9	[1],[2]
Total before taxes	(1.0)	[2]	(0.7)	[2]	(3.1)	[2]	(2.4)	[2]
Income tax benefit	0.4	[2]	0.2	[2]	1.2	[2]	0.9	[2]
Total, net of tax	$ (0.6)	[2]	$ (0.5)	[2]	$ (1.9)	[2]	$ (1.5)	[2]

[1] These accumulated other comprehensive (income) loss components are included in the computation of postretirement benefit plan (benefit) and defined benefit plan expense. See Note 8.

[2] Amounts in parentheses indicate credits to net income.