Financial Instruments and Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0	$ 0
Franchise rights impairment	0	0	4.2	0
Continuing Operations [Member] \| Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-lived assets held for sale	77.4		77.4
Discontinued Operations [Member] \| Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-lived assets held for sale	49.4		49.4
Nonrecurring [Member] \| Continuing Operations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment of long-lived assets held and used	0.3	0	0.3	0
Impairment of long-lived assets held for sale	0	0	0	0
Nonrecurring [Member] \| Discontinued Operations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impairment of long-lived assets held for sale	0	0	0.1	0.5
Nonrecurring [Member] \| Discontinued Operations [Member] \| Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-lived assets held for sale	3.8	11.4	3.8	11.4
Franchise Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Franchise rights impairment	0	0	4.2	0
Fair Value, Inputs, Level 3 [Member] \| Nonrecurring [Member] \| Discontinued Operations [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-lived assets held for sale	$ 3.7	$ 10.9	$ 3.7	$ 10.9

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

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+ Details