Lease Obligations (Operating Leases) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Lease Term In Excess Of One Year [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 18.1	$ 12.7	$ 51.5	$ 37.1
Lease Term In Excess Of One Year [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Operating leases, term of contract	1 year	1 year	1 year	1 year
Lease Term Of One Year Or Less [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 54.5	$ 63.0	$ 142.6	$ 138.9
Lease Term Of One Year Or Less [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases, term of contract	1 year	1 year	1 year	1 year