Commitments And Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Rent expense	$ 129.3	$ 125.2	$ 81.0
Letters of credit outstanding amount	26.0
Purchase Commitments	54.1
HRM Performance Bond Obligations [Member]
Guarantee	30.0
Liability of obligations	0.2
Letter Of Credits Expiration for the Current Year [Member]
Letters of credit outstanding amount	18.2
Letters of Credit Expiration for the Preceding One to Three Years [Member]
Letters of credit outstanding amount	7.6
Letters Of Credit Expiration After Three Years [Member]
Letters of credit outstanding amount	$ 0.2