Income Taxes Effective Tax Rate Reconciliation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective income tax reconciliation, amount
Income Tax (Expense) Benefit at U.S. Statutory Rate	$ (46.4)	$ (74.4)	$ (70.1)
U.S. State and Local Tax (Expense) Benefit	(5.9)	(7.7)	(6.3)
Goodwill Impairment	(8.6)	0	0
Capital Loss on Subsidiary Stock	0	5.4	0
Permanent Items	(4.7)	(3.5)	(3.4)
Change in Valuation Allowance	(5.1)	(15.2)	(1.8)
International Tax Rate Differences	3.5	2.9	0.4
Foreign Withholding Tax	(0.1)	(0.4)	(0.2)
Non taxable excise tax credit refunds	0	29.4	0
Change in Tax Rate	4.5	(3.6)	0
US Federal & State Research Credits	20.1	0	0
Adjustment to Tax Contingencies	(4.5)	0	(0.1)
Other	1.8	(0.3)	(1.0)
Income Tax Expense	$ 45.4	$ 67.4	$ 82.5
Effective income tax reconciliation, percent
Income Tax (Expense) Benefit at U.S. Statutory Rate, percent	35.00%	35.00%	35.00%
U.S. State and Local Tax Expense, percent	4.40%	3.60%	3.10%
Goodwill Impairment, percent	6.50%	0.00%	0.00%
Capital Loss on Subsidiary Stock, percent	0.00%	(2.60%)	0.00%
Permanent Items. percent	3.50%	1.70%	1.60%
Change in Valuation Allowance, percent	3.90%	7.20%	0.90%
International Tax Rate Differences, percent	(2.60%)	(1.40%)	(0.10%)
Foreign Withholding Tax, percent	0.00%	0.20%	0.10%
Non taxable excise tax credit refunds, percent	0.00%	(13.80%)	0.00%
Change in Tax Rate, percent	(3.40%)	1.70%	0.00%
US Federal & State Research Credit, percent	(15.10%)	0.00%	0.00%
Adjustment to Tax Contingencies, percent	3.40%	0.00%	0.10%
Other, percent	(1.40%)	0.10%	0.50%
Income Tax Expense, percent	34.20%	31.70%	41.20%