Operating Segments -Summarized Financial Information by Reportable Segments (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating Segments [Abstract]
Defined benefit pension and other postretirement (costs) credits included in corporate and other	$ 0.9	$ 0.9	$ (13.7)	$ 2.0