Pension Plans and Other Postretirement Benefits (Components of net periodic benefit) (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
Pension Benefits [Member]
Components of net periodic benefit cost
Service costs	$ 0.6	$ 0.7	$ 1.7	$ 2.0
Interest costs	0.5	0.5	1.7	1.5
Expected return on plan assets	(2.5)	(2.2)	(7.6)	(6.6)
Recognized net actuarial loss	0	0.2	0	0.5
Net periodic benefit (gains) costs	(1.4)	(0.8)	(4.2)	(2.6)
Postretirement Benefits [Member]
Components of net periodic benefit cost
Service costs	0	0	0	0
Interest costs	0.2	0.2	0.5	0.5
Expected return on plan assets	0	0	0	0
Recognized net actuarial loss	0.1	0.2	0.4	0.6
Net periodic benefit (gains) costs	$ 0.3	$ 0.4	$ 0.9	$ 1.1