CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 178.6	$ 149.6	$ 241.7
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(2.6)	0.3	1.4
Unrealized (losses) gains on derivative contracts	(3.8)	10.0	(16.9)
Pension and postretirement liability adjustments, net	(7.7)	(101.9)	(29.0)
Amortization of prior service costs and actuarial losses	20.3	14.5	12.1
Total other comprehensive income (loss), net of tax	6.2	(77.1)	(32.4)
Comprehensive income	$ 184.8	$ 72.5	$ 209.3