Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Foreign Currency Translation [Abstract]
Balance at beginning of period		$ (1.0)	$ 4.6	$ 1.0	$ 4.7
Other comprehensive income (loss):
Foreign currency translation gain (loss)		0.0	(2.5)	(2.0)	(2.6)
Balance at end of period		(1.0)	2.1	(1.0)	2.1
Cash flow hedges
Balance at beginning of period		(24.5)	7.4	(32.2)	18.3
Other comprehensive income (loss):
Gains (losses) arising in period		(27.5)	(2.7)	(47.0)	(9.6)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax		0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		(27.5)	(2.7)	(47.0)	(9.6)
Reclassification of losses (gains) to net income (loss)		14.2	3.9	41.4	(0.1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		0.0	0.0	0.0	0.0
Net amount of reclassification of losses (gains) to net income (loss)		14.2	3.9	41.4	(0.1)
Total other comprehensive income (loss), net of tax		(13.3)	1.2	(5.6)	(9.7)
Balance at end of period		(37.8)	8.6	(37.8)	8.6
Unrealized holding gains (losses) on securities
Balance at beginning of period		0.4	0.4	0.4	0.4
Other comprehensive income (loss):
Unrealized holding gains (losses) arising in period		0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax		0.0	0.0	0.0	0.0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax		0.0	0.0	0.0	0.0
Balance at end of period		0.4	0.4	0.4	0.4
Pension and OPEB plans
Balance at beginning of period		(187.3)	259.6	(173.6)	300.0
Other comprehensive income (loss):
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax		0.0	(2.1)	0.0	(2.1)
Gains (losses) arising in period		0.0	(3.0)	0.0	(8.3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax		0.0	(5.1)	0.0	(10.4)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax		0.0	0.0	0.0	0.0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax		0.0	(5.1)	0.0	(10.4)
Reclassification to net income (loss):
Reclassification of prior service cost (credits) included in net income (loss)		(15.1)	(17.2)	(45.2)	(51.7)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax		8.2	1.0	24.6	0.4
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax		(6.9)	(16.2)	(20.6)	(51.3)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax		0.0	0.0	0.0	0.0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax		(6.9)	(16.2)	(20.6)	(51.3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		(6.9)	(21.3)	(20.6)	(61.7)
Balance at end of period		(194.2)	238.3	(194.2)	238.3
Cost of Sales [Member] | Other Contract [Member]
Other comprehensive income (loss):
Reclassification of losses (gains) to net income (loss)	[1]	14.2	3.9	41.4	(0.1)
Pension and OPEB Expense (Income) [Member]
Reclassification to net income (loss):
Reclassification of prior service cost (credits) included in net income (loss)	[2]	(15.1)	(17.2)	(45.2)	(51.7)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	[2]	$ 8.2	$ 1.0	$ 24.6	$ 0.4

[1] Amounts are included in cost of products sold on the Condensed Consolidated Statements of Operations.

[2] Amounts are included in pension and OPEB expense (income) on the Condensed Consolidated Statements of Operations.