Employee Benefits Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 0.4	$ 0.4	$ 0.6	$ 1.0
Interest cost		1.4	1.1	2.6	2.4
Expected return on plan assets		(1.4)	(1.4)	(2.8)	(2.8)
Amortization of prior service costs	[1]	0.3	0.1	0.4	0.9
Amortization of actuarial losses	[1]	0.4	0.0	0.6	0.3
Curtailment loss	[2]	0.0	11.2	0.0	11.2
Periodic expense		1.1	11.4	1.4	13.0
Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost		0.0	0.0	0.1	0.1
Amortization of prior service costs	[1]	0.1	0.1	0.1	0.1
Periodic expense		$ 0.1	$ 0.1	$ 0.2	$ 0.2

[1] Amortization of prior service costs and actuarial losses out of accumulated other comprehensive income are recognized in the Condensed Consolidated Statements of Operations within "General and administrative" expense.

[2] A curtailment is recognized immediately when there is a significant reduction in, or an elimination of, defined benefit accruals for current employees' future services. These expenses are included on the Condensed Consolidated Statements of Operations within "General and administrative" expense for the three and six months ended June 30, 2015.