Related Party Costs and Expenses [Text] (Details) (SAC Holdings, Four SAC, Five SAC, Galaxy, and Private Mini [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015
SAC Holdings, Four SAC, Five SAC, Galaxy, and Private Mini [Member]
Related party costs and expenses:
Revenue, excluding dealer agreement commissions and expenses	$ 31.9
Revenue, generated by the dealer agreement from related parties	241.3
Commission expenses, generated from dealer agreement with related parties	52.1
Expenses, related parties	2.6
Cash flow, related party	$ 60.0