Leasing Arrangements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Future minimum capital lease payments
2013	$ 1.2
2014	1.5
2015	1.5
2016	1.4
2017	1.4
Subsequent to 2017	6.5
Total minimum lease payments	13.5
Amounts representing interest	1.8
Present value of net minimum lease payments	11.7
Current maturities	0.5
Long-term capital lease obligation	11.2
Future minimum operating lease payments
2013	38.6
2014	29.4
2015	24.0
2016	19.2
2017	12.6
Subsequent to 2017	34.1
Total minimum lease payments	157.9
Rental expense for all operating leases
Rental expense for all operating leases	42.9	40.9	41.3
Rental income on subleases of equipment	0.6	0.8	0.9
Assets recorded under capital leases
Plant and equipment	12.3	3.0
Less accumulated amortization	0.7	0.1
Assets recorded under capital leases	11.6	2.9
Capital lease obligations with lease agreements to acquire plant and equipment	$ 9.3	$ 3.0	$ 0