Shareholders' Equity - Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net unrealized (losses) gains on derivative financial instruments:
Net holding (losses) gains arising during the period	$ 5.1	$ 0.3	$ 0.7
Tax benefit (expense)	(2.0)	(0.1)	(0.1)
Reclassification adjustment for net realized (gains) losses included in net loss	(3.0)	0.8	0
Tax expense (benefit)	1.0	(0.2)	0
Total net unrealized (losses) gains on derivative financial instruments	1.1	0.8	0.6
Net pension adjustments:
Reclassification of adjustments for defined benefit plans recorded in net loss	(0.9)	(13.0)	8.2
Tax (expense) benefit	(0.1)	0.3	(3.6)
Total net pension adjustments	(1.0)	(12.7)	4.6
Unrealized foreign currency translation (losses) gains	$ (1.7)	$ 0	$ 3.0