Employee Benefit Plans (Components of Net Period Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.3	$ 0.5	$ 0.5	$ 0.9
Interest cost	5.2	5.4	10.4	10.7
Expected return on plan assets	(7.8)	(8.2)	(15.7)	(16.4)
Net periodic benefit gains	(2.3)	(2.3)	(4.8)	(4.8)
Post-retirement Health Care Plan Benefit
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.1	0.2	0.2	0.3
Net periodic benefit gains	$ 0.1	$ 0.2	$ 0.2	$ 0.3