Leases (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases, Operating [Abstract]
2014	$ 133.0
2015	126.7
2016	99.6
2017	97.3
2018	91.1
Thereafter	221.6
Total minimum payments required	769.3
Lease expense	$ 185.9	$ 153.3	$ 148.6