Contingencies and Healthcare Regulation (Capital Expenditure Commitments) (Details) (USD $) In Millions, unless otherwise specified			27 Months Ended	15 Months Ended	9 Months Ended	27 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Mar. 31, 2013 Capital expenditure commitments [Member] DMC commitment [Member]	Mar. 31, 2013 Capital expenditure commitments [Member] DMC commitment [Member] Calendar Year 2012 [Member]	Mar. 31, 2013 Capital expenditure commitments [Member] Other commitments [Member]	Mar. 31, 2013 Capital expenditure commitments, specific expansion projects [Member] DMC commitment [Member]	Jun. 30, 2013 Capital expenditure commitments, specific expansion projects [Member] DMC commitment [Member] Calendar Year 2011 [Member]	Sep. 30, 2012 Capital expenditure commitments, specific expansion projects [Member] DMC commitment [Member] Calendar Year 2011 [Member]	Dec. 31, 2012 Capital expenditure commitments, specific expansion projects [Member] DMC commitment [Member] Calendar Year 2011 [Member]	Dec. 31, 2011 Capital expenditure commitments, specific expansion projects [Member] DMC commitment [Member] Calendar Year 2011 [Member]	Feb. 29, 2012 Capital expenditure commitments, specific expansion projects [Member] DMC commitment [Member] Calendar Year 2011 [Member]	Feb. 28, 2013 Capital expenditure commitments, specific expansion projects [Member] DMC commitment [Member] Calendar Year 2012 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount			$ 850.0		$ 103.8	$ 500.0			$ 80.0	$ 80.0
Commitment period, years			5 years
Actual expense			279.5	79.2		159.2	10.5	41.8
Capital Expenditure Commitment, Reimbursement Receivable				16.5
Escrowed cash for capital commitments	$ 17.3	$ 20.3									$ 41.8	$ 27.8