Significant Accounting Policies (Details 7) In Millions, unless otherwise specified	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2014 Interest rate swap USD ($) instrument	Dec. 31, 2013 Interest rate swap USD ($)	Mar. 31, 2014 Interest rate swap Other liabilities USD ($)	Dec. 31, 2013 Interest rate swap Other liabilities USD ($)	Dec. 31, 2013 Interest rate swap Deferred costs and other assets USD ($)	Mar. 31, 2014 Interest rate cap USD ($) instrument	Mar. 31, 2014 USD-Yen currency forward contract JPY (¥)	Mar. 31, 2014 USD-Yen currency forward contract Deferred costs and other assets USD ($)	Dec. 31, 2013 USD-Euro currency forward contract EUR (€)	Mar. 31, 2014 USD-Euro currency forward contract Other liabilities USD ($)	Dec. 31, 2013 USD-Euro currency forward contract Other liabilities USD ($)
Derivative financial instruments
Number of Instruments			1					5
Notional Amount			$ 91.1					$ 247.2	¥ 1,500.0		€ 74.0
Interest rate net, fair value				3.0	(0.2)	(0.4)	3.4
Forward contract net, fair value										4.6		(0.8)	(0.8)
Gross accumulated other comprehensive income or loss related to derivative activities	$ 66.7	$ 61.8