Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2010 Muncie Plant [Member]	Dec. 31, 2011 Muncie Plant [Member]
Defined Benefit Plan Disclosure [Line Items]
Recognized net (gain) loss due to settlements		$ 5.7
Employer contribution						23.0	15.0
Estimated future employer contributions in next fiscal year				15	25
Defined contribution expense	24.9	24.8	18.9
Defined benefit pension expense	24.3	27.3	17.5
Other postretirement employee benefit expense	5.7	11.1	13.5
Total	54.9	63.2	49.9
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year, Under Contractual Obligation	$ 2.8