Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Revolving Credit Facility | 2012 ABL Revolver | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Line of credit, fair value disclosure	$ 35.0
Senior Notes | 2013 Senior Notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable, fair value disclosure	400.0	400.0
Senior Notes | 2012 Senior Notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable, fair value disclosure	250.0	250.0
Senior Notes | Nonrecurring | Fair Value, Inputs, Level 2 | 2013 Senior Notes | Market Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable, fair value disclosure	409.0	408.5
Senior Notes | Nonrecurring | Fair Value, Inputs, Level 2 | 2012 Senior Notes | Market Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable, fair value disclosure	277.8	280.6
Term Loans | 2012 Term Loan | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable, fair value disclosure	287.5	287.5
Term Loans | Nonrecurring | Fair Value, Inputs, Level 2 | 2012 Term Loan | Market Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans payable, fair value disclosure	$ 288.2	$ 288.9