Pension and Other Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Assets and liabilities [Abstract]
Liability - current	$ (0.8)	$ (0.9)
Liability - long term	(37.1)	(37.5)
Accumulated other comprehesive income [Abstract]
Prior service cost (credit)	0.8	0.6
Net actuarial loss (gain)	41.7	45.4
Other Postretirement Benefit Plans, Defined Benefit [Member]
Assets and liabilities [Abstract]
Liability - current	(0.2)	(0.6)
Liability - long term	0	(4.9)
Accumulated other comprehesive income [Abstract]
Prior service cost (credit)	(2.1)	(42.3)
Net actuarial loss (gain)	$ (12.8)	$ (26.0)