Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Commitments And Contingencies [Line Items]
Rent expense for operating leases	$ 223.4	$ 196.3	$ 133.1
Contingent rent expense	23.3	20.3	16.1
Long term purchase commitment milestone	18.7	9.3	5.9
Estimated obligation for long term purchase commitment milestones	15.1
Maximum obligation for long term purchase commitment milestones	$ 23.1	$ 42.1
Non-cancelable Operating Leases [Member]
Schedule Of Commitments And Contingencies [Line Items]
Lease expiration period	Jul. 01, 2114
Non-cancelable Capital Leases [Member]
Schedule Of Commitments And Contingencies [Line Items]
Lease expiration period	Jul. 01, 2018
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