Stockholders Equity (Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Estimated tax rate	40.00%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2013	$ 9.2
Unrealized losses, arising during the period	(3.6)
Amounts reclassified out of AOCI during the period	1.2
Taxes on unrealized losses, arising during the period	0.9
Balance at March 31, 2014	7.7
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2013	4.3
Unrealized losses, arising during the period	(1.2)
Amounts reclassified out of AOCI during the period	1.2
Taxes on unrealized losses, arising during the period	0
Balance at March 31, 2014	4.3
Forward Contract Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2013	4.9
Unrealized losses, arising during the period	(2.4)
Amounts reclassified out of AOCI during the period	0
Taxes on unrealized losses, arising during the period	0.9
Balance at March 31, 2014	$ 3.4