Employee Benefits Schedule of Net Periodic Benefit Cost (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 0.1		$ 0.1
Amortization of prior service costs (1)	0	[1]	0.1	[1]
Periodic expense	0.1		0.2
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.6		0.7
Interest cost	1.3		1.4
Expected return on plan assets	(1.4)		(1.2)
Amortization of prior service costs (1)	0.8	[1]	1.2	[1]
Amortization of actuarial losses (1)	0.3	[1]	0.2	[1]
Periodic expense	$ 1.6		$ 2.3

[1] Amortization of prior service costs and actuarial losses out of AOCI are recognized in the Condensed Consolidated Statements of Operations in "General and administrative."