Principles of Consolidation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Impaired Long-Lived Assets Held and Used [Line Items]
Disposal Group, Including Discontinued Operation, Long Lived Assets	$ 16.5		$ 16.5		$ 17.2
Impairment of Long-Lived Assets Held-for-use	$ 0.8	$ 0.6	$ 2.4	$ 3.3