Derivatives Forward Contracts (Details) In Millions, unless otherwise specified					3 Months Ended		9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2013 JPY (¥)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 JPY (¥)	Sep. 30, 2013 Forward Contracts USD ($)	Sep. 30, 2012 Forward Contracts USD ($)	Sep. 30, 2013 Forward Contracts USD ($)	Sep. 30, 2012 Forward Contracts USD ($)	Sep. 30, 2013 Forward Contracts SEK	Dec. 31, 2012 Forward Contracts USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 2,200.0	¥ 217,100.0	$ 2,700.0	¥ 230,000.0	$ 16.4		$ 16.4		105.0	$ 31.2
Changes in derivative instruments
Beginning balance					(0.1)	0	(0.1)	0
Purchases					0	0	0	0
Realized and unrealized (losses) gains					(0.5)	0.3	(0.3)	0.3
Sales/settlements					0.5	0	0.3	0
Ending balance					$ (0.1)	$ 0.3	$ (0.1)	$ 0.3