Guarantees (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Guarantees [Abstract]
Charge related to field corrective action	$ 2.5	$ 16.0
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	42.2		17.8
Provision for warranties during the period	6.6		3.3
Warranty claims during the period	(6.8)		(3.3)
Balance at end of period	$ 42.0		$ 17.8