Principles Of Consolidation (Fair Value Measurement) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Amounts Held In Escrow, Current, Fair Value Disclosure	$ 15.5
Restricted amounts held in escrow-long term	102.5
Total assets at fair value	118.0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Amounts Held In Escrow, Current, Fair Value Disclosure	0
Restricted amounts held in escrow-long term	0
Total assets at fair value	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Amounts Held In Escrow, Current, Fair Value Disclosure	0
Restricted amounts held in escrow-long term	0
Total assets at fair value	0
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Amounts Held In Escrow, Current, Fair Value Disclosure	15.5
Restricted amounts held in escrow-long term	102.5
Total assets at fair value	$ 118.0