Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension, SERP and Retiree medical adjustments, tax	$ (51.5)	$ 19.5	$ 30.5
Unrealized foreign exchange gain (loss) on intercompany loan, tax	(0.4)	(0.8)	0
Interest Rate Swap [Member]
Unrealized gain (loss) on derivatives arising during period, tax	0	0	2.4
Reclassification adjustment on derivatives, tax	0	1.7	3.1
Foreign Exchange Contract [Member]
Unrealized gain (loss) on derivatives arising during period, tax	0	0	0.2
Reclassification adjustment on derivatives, tax	0	0	0.1
Other comprehensive income reclassification adjustment on derivatives realized in other assets, tax	$ 0	$ 0	$ 0.4