Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v2.4.0.6
Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Liabilities  
Interest rate swap contracts included in Accounts Payable $ 3.1
Fair Value Measurements, Recurring [Member]
 
Assets  
Cash and cash equivalents 265.4
Restricted cash and cash equivalents 202.9
Restricted short-term investments 6.0
Total Assets 474.3
Liabilities  
Interest rate swap contracts included in Accounts Payable 3.1
Total Liabilities 3.1
Level 1 [Member] | Fair Value Measurements, Recurring [Member]
 
Assets  
Cash and cash equivalents 265.4
Restricted cash and cash equivalents 202.9
Restricted short-term investments 0
Total Assets 468.3
Liabilities  
Interest rate swap contracts included in Accounts Payable 0
Total Liabilities 0
Level 2 [Member] | Fair Value Measurements, Recurring [Member]
 
Assets  
Cash and cash equivalents 0
Restricted cash and cash equivalents 0
Restricted short-term investments 6.0
Total Assets 6.0
Liabilities  
Interest rate swap contracts included in Accounts Payable 3.1
Total Liabilities 3.1
Level 3 [Member] | Fair Value Measurements, Recurring [Member]
 
Assets  
Cash and cash equivalents 0
Restricted cash and cash equivalents 0
Restricted short-term investments 0
Total Assets 0
Liabilities  
Interest rate swap contracts included in Accounts Payable 0
Total Liabilities $ 0