CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 44.3	$ 29.1	$ 159.1
Unrealized foreign currency translation gain (loss)	4.4	(5.0)	(15.1)
Net loss from pension and other postretirement benefit liabilities	(31.2)	(29.9)	(10.9)
Reclassification of amortization of adjustments to pension and other postretirement benefit liabilities recognized in net periodic benefit cost	5.1	2.5	1.9
SERP settlement charge	3.5
Curtailment loss	0.3
Unrealized gain on "available-for-sale" securities	0.1
Reclassification of cumulative currency translation adjustments related to investments in Canada (Note 12)			87.9
Income (Loss) from other comprehensive income items	(17.8)	(32.4)	(112.0)
Benefit for income taxes	(7.7)	(10.2)	(3.0)
Other comprehensive income (loss)	(10.1)	(22.2)	(109.0)
Comprehensive income	$ 34.2	$ 6.9	$ 50.1