Income Tax Expense - Effective Income Tax Reconciliation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
U.S. state income taxes, net of federal benefit	6.90%	14.80%	(35.80%)
Federal benefit of R&D and AMT credits, net	0.50%	9.90%	(0.70%)
Foreign earnings at lower rates than U.S. federal rate	(1.40%)	39.70%	(149.60%)
Federal (benefit) expense of U.S. permanent differences	(8.80%)	(116.10%)	66.80%
Federal valuation allowance adjustments	47.70%	(72.70%)	230.80%
Other	2.20%	0.20%	(0.50%)
Effective income tax rate	82.10%	(89.20%)	146.00%
Income tax expense (benefit)	$ (117.7)	$ 20.7	$ 18.4
Valuation allowance, change in amount	(62.5)	4.9
Minimum
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:
Foreign statutory tax rate	0.00%
Maximum
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:
Foreign statutory tax rate	35.00%
WMS Acquisition
Reconciliation of the U.S. federal statutory tax rate to the actual tax rate is as follows:
Income tax expense (benefit)	(131.1)
Valuation allowance, change in amount	$ (68.9)