Description Of Business And Summary Of Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 777.2
Translation adjustments	(29.1)	$ (27.5)	$ (3.7)
Accumulated other comprehensive loss	(71.3)	(42.3)
Ending Balance	705.2	777.2
Accumulated Foreign Currency Adjustment Attributable to Parent
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Translation adjustments	(29.1)	(27.5)	(3.7)
Accumulated other comprehensive loss		(47.7)	(20.2)	$ (16.5)
Unrecognized gain on available-for-sale securities	0.0
Ending Balance	(76.8)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Translation adjustments	0.0	0.0	0.0
Accumulated other comprehensive loss		5.2	5.2	5.2
Unrecognized gain on available-for-sale securities	0.0
Ending Balance	(5.2)
Accumulated Net Investment Gain (Loss) Attributable to Parent
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Translation adjustments	0.0	0.0	0.0
Accumulated other comprehensive loss		0.2	0.2	0.2
Unrecognized gain on available-for-sale securities	0.1
Ending Balance	0.3
Accumulated Other Comprehensive Loss
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(42.3)	(14.8)	(11.1)
Translation adjustments	(29.1)	(27.5)	(3.7)
Accumulated other comprehensive loss		(42.3)	(14.8)	$ (11.1)
Unrecognized gain on available-for-sale securities	0.1
Ending Balance	$ (71.3)	$ (42.3)	$ (14.8)