Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - Pension and other postretirement benefits - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.9	$ 2.8	$ 7.8	$ 5.6
Interest cost	1.5	1.2	3.0	2.4
Expected return on plan assets	(2.0)	(1.4)	(4.0)	(2.8)
Plan curtailment, settlement and termination	0.0	0.3	0.0	0.6
Amortization of prior service costs	0.1	0.1	0.2	0.2
Recognized net actuarial losses	0.2	0.3	0.4	0.6
Net periodic benefit cost	$ 3.7	$ 3.3	$ 7.4	$ 6.6