Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Accumulated other comprehensive loss, net of tax
Foreign currency translation	$ 88.9		$ 80.5
Pension and other postretirement liability adjustment, net of deferred tax effect	(189.2)		(193.4)
Accumulated other comprehensive loss	(100.3)		(112.9)
Tax effect of pension liability adjustment	118.3		120.9
Other comprehensive income, before reclassification, foreign currency translation	8.4
Other comprehensive income, before reclassification, pension	0
Other comprehensive income, reclassification adjustment, foreign currency translation	0
Other comprehensive income, reclassification, pension	4.2
Translation adjustments	8.4	35.9
Pension and other postretirement liability adjustments, net of tax	4.2	6.5
Other comprehensive income	12.6	42.3
Before reclassification [Member]
Accumulated other comprehensive loss, net of tax
Other comprehensive income	8.4
Reclassified [Member]
Accumulated other comprehensive loss, net of tax
Other comprehensive income	$ 4.2