Consolidated Statements of Comprehensive Loss (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net loss	$ (114.7)	[1]	$ (44.4)	[1]	$ (340.7)
Net unrealized (losses) gains on derivative financial instruments:
Net holding gains arising during the period	6.1		7.0		3.1
Reclassification adjustment for net realized (gains) losses recorded in net loss	(3.4)		(7.3)		(2.0)
Total net unrealized (losses) gains on derivative financial instruments	2.7		(0.3)		1.1
Net pension adjustments, net of tax:
Liability adjustments for defined benefit pension plans	(10.4)		10.7		(4.9)
Reclassification of adjustments for defined benefit plans recorded in net loss	1.4		5.5		3.9
Total net pension adjustments	(9.0)		16.2		(1.0)
Unrealized foreign currency translation losses	(15.7)		(4.5)		(1.7)
Total other comprehensive income (loss), net of tax	(22.0)		11.4		(1.6)
Comprehensive loss	$ (136.7)		$ (33.0)		$ (342.3)

[1] The sum of the quarterly loss per share may not equal the annual loss per share due to changes in average shares outstanding.