Debt (European letter of Credit Facilities) (Details) In Millions, unless otherwise specified	9 Months Ended	0 Months Ended
	Sep. 30, 2013	Oct. 30, 2009 European Letter of Credit Facilities [Member] EUR (€)	Sep. 30, 2013 European Letter of Credit Facilities [Member] USD ($)	Sep. 30, 2013 European Letter of Credit Facilities [Member] EUR (€)	Dec. 31, 2012 European Letter of Credit Facilities [Member] USD ($)	Dec. 31, 2012 European Letter of Credit Facilities [Member] EUR (€)
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Period		364 days
Maximum borrowing capacity		€ 125.0
Maturity Period of Surety and Performance Bonds Bank Guarantees and Similar Obligations in Respect of New Letter of Credit Facility is Used	5 years
Letters of credit outstanding			$ 100.5	€ 74.3	$ 83.3	€ 63.1