Financial Instruments and Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Measurements [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0
Franchise rights impairment	0	4.2	0
Continuing Operations [Member] | Carrying Value [Member]
Fair Value Measurements [Line Items]
Long-lived assets held for sale	59.8	70.4
Discontinued Operations [Member] | Carrying Value [Member]
Fair Value Measurements [Line Items]
Long-lived assets held for sale	34.5	43.2
Nonrecurring [Member] | Continuing Operations [Member] | Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]
Fair Value Measurements [Line Items]
Impairment of long-lived assets held and used	0.7	0.8
Impairment of long-lived assets held for sale	0	0
Nonrecurring [Member] | Discontinued Operations [Member] | Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]
Fair Value Measurements [Line Items]
Impairment of long-lived assets held for sale	0	0.1
Nonrecurring [Member] | Discontinued Operations [Member] | Carrying Value [Member] | Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]
Fair Value Measurements [Line Items]
Long-lived assets held for sale		3.8
Nonrecurring [Member] | Level 3 [Member] | Discontinued Operations [Member] | Fair Value [Member] | Long Lived Assets, Fair Value Disclosure, Impairment Loss [Member]
Fair Value Measurements [Line Items]
Long-lived assets held for sale		3.7
Goodwill [Member]
Fair Value Measurements [Line Items]
Date of annual goodwill and indefinite lived intangible assets impairment test	April 30	April 30	April 30
Franchise rights [Member]
Fair Value Measurements [Line Items]
Date of annual goodwill and indefinite lived intangible assets impairment test	April 30	April 30	April 30
Franchise rights [Member] | Nonrecurring [Member]
Fair Value Measurements [Line Items]
Franchise rights impairment	$ 0	$ 4.2	$ 0