Intangible Assets Future Amortization Expense (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Future Amortization Expense, Remainder of Fiscal Year	$ 18.9
Future Amortization Expense, 2014	26.4
Future Amortization Expense, 2015	6.0
Future Amortization Expense, 2016	4.5
Future Amortization Expense, 2017	4.6
Future Amortization Expense, 2018	4.6
Future Amortization Expense, after Year 2018	$ 13.0