Liquidity (Risks and Uncertainties) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Risks and Uncertainties [Line Items]
Net cash used in operating activities	$ 13.9	$ 17.1
Borrowed Funds	1,369.7
Operating Leases, Future Minimum Payments, Due Remainder of Fiscal Year	37.0
Operating Leases, Future Minimum Payments Due	136.8
Payments to Acquire Property, Plant, and Equipment	17.2	15.1
Other Postretirement Benefit Plans, Defined Benefit [Member]
Risks and Uncertainties [Line Items]
Defined Benefit Plan, Estimated Benefit Obligation for Remaining Fiscal Year	50.4
Multiemployer Plans, Pension [Member]
Risks and Uncertainties [Line Items]
Defined Benefit Plan, Estimated Benefit Obligation for Remaining Fiscal Year	60.9
ABL Facility Credit Agreement [Member]
Risks and Uncertainties [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400.0
Line Of Credit Facility, Total Availability	214.8
Line of Credit Facility, Remaining Borrowing Capacity	$ 359.0