Liquidity Risks and Uncertainties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Risks and Uncertainties [Line Items]
Net Cash Provided by (Used in) Operating Activities			$ 16.6	$ 61.3
Net income (loss)	22.6	43.0	104.2	145.6
Increase (Decrease) Sales Revenue, Services			65.0
Operating loss decrease				40.7
Borrowed Funds	1,382.9		1,382.9
Operating Leases, Future Minimum Payments, Due Remainder of Fiscal Year	24.6		24.6
Operating Leases, Future Minimum Payments Due	151.7		151.7
Payments to Acquire Property, Plant, and Equipment			30.7	22.7
Operating Leases, Future Lease Commitments, Amount	55.1		55.1
Average operating lease term			3 years
Other Postretirement Benefit Plans, Defined Benefit [Member]
Risks and Uncertainties [Line Items]
Defined Benefit Plan, Estimated Benefit Obligation for Remaining Fiscal Year			55.8
Multiemployer Plans, Pension [Member]
Risks and Uncertainties [Line Items]
Defined Benefit Plan, Estimated Benefit Obligation for Remaining Fiscal Year			42.5
ABL Facility Credit Agreement [Member]
Risks and Uncertainties [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	400.0		400.0
Line Of Credit Facility, Total Availability	248.7		248.7
Line of Credit Facility, Remaining Borrowing Capacity	$ 360.2		$ 360.2