Lease Obligations (Operating Lease Obligations) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Lease Term In Excess Of One Year [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 17.3	$ 12.6	$ 33.3	$ 24.5
Lease Term Less Than One Year [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 40.4	$ 39.0	$ 88.2	$ 75.9