Financial Instruments and Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Goodwill impairment	$ 0	$ 0	$ 0	$ 0
Franchise rights impairment	4.2	0	4.2	0
Continuing Operations [Member] | Carrying Value [Member]
Long-lived assets held for sale	76.7		76.7
Discontinued Operations [Member] | Carrying Value [Member]
Long-lived assets held for sale	49.4		49.4
Nonrecurring [Member] | Continuing Operations [Member]
Impairment of long-lived assets held and used	0	0	0	0
Impairment of long-lived assets held for sale	0	0	0	0
Nonrecurring [Member] | Discontinued Operations [Member]
Impairment of long-lived assets held for sale	0.1	0.5	0.1	0.5
Nonrecurring [Member] | Discontinued Operations [Member] | Carrying Value [Member]
Long-lived assets held for sale	3.8	11.4	3.8	11.4
Franchise Rights [Member]
Franchise rights impairment	4.2	0	4.2	0
Fair Value, Inputs, Level 3 [Member] | Nonrecurring [Member] | Discontinued Operations [Member] | Fair Value [Member]
Long-lived assets held for sale	$ 3.7	$ 10.9	$ 3.7	$ 10.9