Leases-Company as Lessee (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]
Expiration date of existing leasing arrangements	Dec. 31, 2043
Rental expense under operating leases	$ 4.5	$ 3.5	$ 3.4
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014	4.7
2015	3.0
2016	2.7
2017	2.7
2018	2.5
Thereafter	12.3
Total	$ 27.9