Liquidity Risks and Uncertainties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Risks and Uncertainties [Line Items]
Line of Credit Facility, Minimum Cash Balance Required	$ 50.0		$ 50.0
Line of Credit Facility, Minimum Cash Balance Required, Increase	120.0		120.0
Net Cash Provided by (Used in) Operating Activities			48.0	52.8
Net income (loss)	(3.0)	122.6	101.2	268.2
Increase (Decrease) Sales Revenue, Services			25.4
Operating loss decrease				94.2
Borrowed Funds	1,377.4		1,377.4
Operating Leases, Future Minimum Payments, Due Remainder of Fiscal Year	12.3		12.3
Operating Leases, Future Minimum Payments Due	150.8		150.8
Payments to Acquire Property, Plant, and Equipment			48.1	36.1
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			9.1
Multiemployer Plans, Pension [Member]
Risks and Uncertainties [Line Items]
Defined Benefit Plan, Estimated Benefit Obligation for Remaining Fiscal Year			21.7
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	237.5		237.5
Line of Credit Facility, Remaining Borrowing Capacity	$ 375.9		$ 375.9