Schedule Of Fair Value Measurements Using Significant Unobservable Inputs (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance	$ 43.7	$ 37.1
Net realized and unrealized gains (loss)	0.5	5.8
Purchases, sales and distributions	(44.5)
Effects of exchange rate changes	0.3	0.8
Ending Balance	0	43.7
Global Multi-Strategy Fund
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance	37.8	31.8
Net realized and unrealized gains (loss)	0.1	5.3
Purchases, sales and distributions	(38.2)
Effects of exchange rate changes	0.3	0.7
Ending Balance	0	37.8
Insurance Investment Contract
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance	5.9	5.3
Net realized and unrealized gains (loss)	0.4	0.5
Purchases, sales and distributions	(6.3)
Effects of exchange rate changes	0	0.1
Ending Balance	$ 0	$ 5.9