Derivatives Forward Contracts (Details) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2014 JPY (¥)	Dec. 31, 2013 USD ($)	Dec. 31, 2013 JPY (¥)	Mar. 31, 2014 Forward Contracts USD ($)	Mar. 31, 2013 Forward Contracts USD ($)	Mar. 31, 2014 Forward Contracts SEK	Dec. 31, 2013 Forward Contracts USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 1,800.0	¥ 187,900.0	$ 1,900.0	¥ 203,600.0	$ 23.2		150.5	$ 20.4
Changes in derivative instruments
Beginning balance					(0.1)	(0.1)
Purchases					0	0
Realized and unrealized gains (losses)					(0.1)	0.4
Sales/settlements					0.1	(0.5)
Ending balance					$ (0.1)	$ (0.2)