Lease Obligations (Schedule Of Future Minimum Rental Payments For Operating Leases And Lease Payments For Capital Leases) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Lease Obligations [Abstract]
Capital lease assets	$ 23.4
Rent expense related to operating leases	173.1	132.9	75.9
Operating leases, future minimum payments due 2012	39.7
Operating leases, future minimum payments due 2013	31.8
Operating leases, future minimum payments due 2014	22.1
Operating leases, future minimum payments due 2015	13.3
Operating leases, future minimum payments due 2016	6.3
Operating leases, future minimum payments due thereafter	4.2
Operating leases, future minimum payments due, Total	117.4
Capital leases, future minimum payments due 2012	19.2
Capital leases, future minimum payments due 2013	15.4
Capital leases, future minimum payments due 2014	5.7
Capital leases, future minimum payments due 2015	1.4
Capital leases, future minimum payments due 2016	0.6
Capital leases, future minimum payments due thereafter
Capital leases, future minimum payments due, Total	42.3
Less amounts representing interest	(1.7)
Total capital lease obligations, net of interest	40.6
Less current portion	(14.3)
Long term portion of capital lease obligations, net of interest	$ 26.3