Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Commitments And Contingencies [Line Items]
Lease expiration period	Dec. 01, 2112
Rent expense for operating leases	$ 196.3	$ 133.1	$ 82.8
Contingent rent expense	20.3	16.1	13.7
Long term purchase commitment milestone	9.3	5.9
Estimated obligation for long term purchase commitment milestones	30.1
Maximum obligation for long term purchase commitment milestones	$ 42.1	$ 17.1
Minimum [Member]
Schedule Of Commitments And Contingencies [Line Items]
Business acquisitions performance target period	1 year
Maximum [Member]
Schedule Of Commitments And Contingencies [Line Items]
Business acquisitions performance target period	3 years