Pension and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Pension Plans, Defined Benefit [Member]	Mar. 31, 2013 Pension Plans, Defined Benefit [Member]	Mar. 31, 2014 Other Postretirement Benefit Plans, Defined Benefit [Member]	Mar. 31, 2013 Other Postretirement Benefit Plans, Defined Benefit [Member]	Apr. 30, 2014 Subsequent Event [Member] Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected employer pension contributions in current fiscal year			$ 196.5
Pension plan contributions	41.3	30.0	41.3				71.1
Estimated employer pension contributions remaining to be made in current fiscal year							84.1
Net periodic benefit cost (income) [Abstract]
Service cost			0.4	0.6	1.0	1.2
Interest cost			36.7	34.7	5.0	5.3
Expected return on assets			(50.7)	(45.9)
Amortization of prior service cost (credit)			1.0	0.9	(18.3)	(20.0)
Amortization of (gain) loss			(0.5)	6.8	(0.3)	0.5
Net periodic benefit cost (income)			$ (13.1)	$ (2.9)	$ (12.6)	$ (13.0)