Income Taxes (Tax Examinations) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014
Income Tax Examination [Line Items]
Unrecognized tax benefit recognition including interest and penalties, if recognized, would effect income tax expense	$ 27.1	$ 5.0
Tax Assessment Year 2005 to 2006 [Member] | IRS
Income Tax Examination [Line Items]
Tax Examination	3.3
Tax Assessment Year 2007 to 2009 [Member] | IRS
Income Tax Examination [Line Items]
Tax Examination	72.9
Income Tax Examination, Increase (Decrease) in Liability from Prior Year, Dissallowed	$ 60.2