Liquidity (Risks and Uncertainties) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Risks and Uncertainties [Line Items]
Net cash used in operating activities	$ 18.2	$ 16.6
Borrowed Funds	1,366.2
Operating Leases, Future Minimum Payments, Due Remainder of Fiscal Year	27.6
Operating Leases, Future Minimum Payments Due	153.4
Payments to Acquire Property, Plant, and Equipment	39.1	30.7
Other Postretirement Benefit Plans, Defined Benefit [Member]
Risks and Uncertainties [Line Items]
Defined Benefit Plan, Estimated Benefit Obligation for Remaining Fiscal Year	36.6
Multiemployer Plans, Pension [Member]
Risks and Uncertainties [Line Items]
Defined Benefit Plan, Estimated Benefit Obligation for Remaining Fiscal Year	43.0
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	218.7
Line of Credit Facility, Remaining Borrowing Capacity	$ 378.9