Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost from discontinued operations	$ 0	$ (6.0)	$ (7.6)	$ (17.9)
Components of net periodic benefit cost:
Service cost	4.2	9.6	19.7	28.9
Interest cost	22.3	33.6	94.3	100.9
Expected return on plan assets	(34.1)	(57.8)	(141.6)	(174.0)
Amortization of prior service credit	0.8	1.1	2.7	3.4
Amortization of net actuarial loss	12.6	29.2	48.7	87.5
Net periodic benefit cost	5.8	11.2	16.9	35.5
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0	(1.5)	(0.7)	(6.7)
Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost from discontinued operations	0	(1.6)	(3.1)	(4.8)
Components of net periodic benefit cost:
Service cost	0.2	0.7	1.2	2.2
Interest cost	2.9	5.1	13.8	15.9
Expected return on plan assets	(1.4)	(2.5)	(7.1)	(8.3)
Amortization of prior service credit	0.1	(0.1)	0.8	(0.2)
Amortization of net actuarial loss	0	0.6	0	1.8
Net periodic benefit cost	$ 1.8	$ 2.2	$ 5.6	$ 6.6