Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Benefits (Textuals) [Abstract]
Pension and Other Postretirement Benefit Contributions	$ 100.0	$ 0
Estimated liability of Postemployment benefits			1.8
Pension Plans, Defined Benefit [Member]
Net Periodic Benefit Cost
Service cost	3.7	2.5
Interest cost	13.3	14.8
Expected return on plan assets	(21.0)	(19.8)
Amortization of:
Prior service cost (credit)	0.5	0.5
Actuarial loss	9.0	6.6
Net Periodic Benefit Cost	5.5	4.6
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net Periodic Benefit Cost
Service cost	2.4	2.1
Interest cost	3.4	3.6
Expected return on plan assets	(4.0)	(4.0)
Amortization of:
Prior service cost (credit)	(0.3)	(0.4)
Actuarial loss	0.3	0
Net Periodic Benefit Cost	$ 1.8	$ 1.3