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Supplemental Guarantor/Non-Guarantor Financial Information Supplemental Guarantor/Non-Guarantor Financial Information (Details 3) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (188.3) | $ (135.8) | $ (226.2) | $ (171.1) | $ (474.3) | $ (283.9) | $ (1,042.3) | $ (157.7) | $ (477.2) | $ (721.4) | $ (1,958.2) | $ (723.5)
Unrealized holding losses on available-for-sale securities |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (3.7)
Reclassification for realized losses included in net (loss) income |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 2.9
Net change in unrealized losses on available-for-sale securities |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.8)
Decrease in fair value of cash flow hedges |  |  |  |  |  |  |  |  |  | 0.0 | (131.3) | (195.0)
Reclassification for realized losses (gains) included in net loss |  |  |  |  |  |  |  |  |  | 146.3 | 251.7 | (10.2)
Net unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  | 146.3 | 120.4 | (205.2)
Prior service (cost) credit for the period |  |  |  |  |  |  |  |  |  | (4.5) | 10.4 | 11.4
Net actuarial gain (loss) for the period |  |  |  |  |  |  |  |  |  | (13.5) | 18.1 | (142.7)
Amortization of actuarial loss and prior service cost included in net (loss) income |  |  |  |  |  |  |  |  |  | 15.4 | 31.9 | 32.7
Postretirement plans and workers' compensation obligations |  |  |  |  |  |  |  |  |  | (2.6) | 60.4 | (98.6)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (1.8) | (34.9) | (41.0)
Other comprehensive income from investment in subsidiaries |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other comprehensive income (loss), net of income taxes |  |  |  |  |  |  |  |  |  | 141.9 | 145.9 | (345.6)
Comprehensive loss |  |  |  |  |  |  |  |  |  | (579.5) | (1,812.3) | (1,069.1)
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 7.9 | 7.1 | 9.7
Comprehensive loss attributable to common stockholders |  |  |  |  |  |  |  |  |  | (587.4) | (1,819.4) | (1,078.8)
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  |  | (729.3) | (1,965.3) | (733.2)
Unrealized holding losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | (3.7)
Reclassification for realized losses included in net (loss) income |  |  |  |  |  |  |  |  |  |  |  | 2.9
Net change in unrealized losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | (0.8)
Decrease in fair value of cash flow hedges |  |  |  |  |  |  |  |  |  | 0.0 | (137.1) | (225.9)
Reclassification for realized losses (gains) included in net loss |  |  |  |  |  |  |  |  |  | 146.3 | 292.1 | 31.3
Net unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  | 146.3 | 155.0 | (194.6)
Prior service (cost) credit for the period |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net actuarial gain (loss) for the period |  |  |  |  |  |  |  |  |  | 8.9 | 5.5 | 0.0
Amortization of actuarial loss and prior service cost included in net (loss) income |  |  |  |  |  |  |  |  |  | (6.1) | 7.2 | 0.0
Postretirement plans and workers' compensation obligations |  |  |  |  |  |  |  |  |  | 2.8 | 12.7 | 0.0
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other comprehensive income from investment in subsidiaries |  |  |  |  |  |  |  |  |  | (7.2) | (21.8) | (150.2)
Other comprehensive income (loss), net of income taxes |  |  |  |  |  |  |  |  |  | 141.9 | 145.9 | (345.6)
Comprehensive loss |  |  |  |  |  |  |  |  |  | (587.4) | (1,819.4) | (1,078.8)
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Comprehensive loss attributable to common stockholders |  |  |  |  |  |  |  |  |  | (587.4) | (1,819.4) | (1,078.8)
Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  |  | 179.4 | 152.7 | 359.9
Unrealized holding losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | 0.0
Reclassification for realized losses included in net (loss) income |  |  |  |  |  |  |  |  |  |  |  | 0.0
Net change in unrealized losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | 0.0
Decrease in fair value of cash flow hedges |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reclassification for realized losses (gains) included in net loss |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Prior service (cost) credit for the period |  |  |  |  |  |  |  |  |  | (4.5) | 10.4 | 11.4
Net actuarial gain (loss) for the period |  |  |  |  |  |  |  |  |  | (22.4) | 12.6 | (152.6)
Amortization of actuarial loss and prior service cost included in net (loss) income |  |  |  |  |  |  |  |  |  | 21.5 | 37.3 | 41.4
Postretirement plans and workers' compensation obligations |  |  |  |  |  |  |  |  |  | (5.4) | 60.3 | (99.8)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other comprehensive income from investment in subsidiaries |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other comprehensive income (loss), net of income taxes |  |  |  |  |  |  |  |  |  | (5.4) | 60.3 | (99.8)
Comprehensive loss |  |  |  |  |  |  |  |  |  | 174.0 | 213.0 | 260.1
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0.0 | 0.8 | 5.2
Comprehensive loss attributable to common stockholders |  |  |  |  |  |  |  |  |  | 174.0 | 212.2 | 254.9
Non-Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  |  | (346.0) | (1,048.8) | (424.9)
Unrealized holding losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | 0.0
Reclassification for realized losses included in net (loss) income |  |  |  |  |  |  |  |  |  |  |  | 0.0
Net change in unrealized losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | 0.0
Decrease in fair value of cash flow hedges |  |  |  |  |  |  |  |  |  | 0.0 | 5.8 | 30.9
Reclassification for realized losses (gains) included in net loss |  |  |  |  |  |  |  |  |  | 0.0 | (40.4) | (41.5)
Net unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  | 0.0 | (34.6) | (10.6)
Prior service (cost) credit for the period |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net actuarial gain (loss) for the period |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 9.9
Amortization of actuarial loss and prior service cost included in net (loss) income |  |  |  |  |  |  |  |  |  | 0.0 | (12.6) | (8.7)
Postretirement plans and workers' compensation obligations |  |  |  |  |  |  |  |  |  | 0.0 | (12.6) | 1.2
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (1.8) | (34.9) | (41.0)
Other comprehensive income from investment in subsidiaries |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other comprehensive income (loss), net of income taxes |  |  |  |  |  |  |  |  |  | (1.8) | (82.1) | (50.4)
Comprehensive loss |  |  |  |  |  |  |  |  |  | (347.8) | (1,130.9) | (475.3)
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 7.9 | 6.3 | 4.5
Comprehensive loss attributable to common stockholders |  |  |  |  |  |  |  |  |  | (355.7) | (1,137.2) | (479.8)
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  |  |  |  |  |  |  |  | 174.5 | 903.2 | 74.7
Unrealized holding losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | 0.0
Reclassification for realized losses included in net (loss) income |  |  |  |  |  |  |  |  |  |  |  | 0.0
Net change in unrealized losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  | 0.0
Decrease in fair value of cash flow hedges |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reclassification for realized losses (gains) included in net loss |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Prior service (cost) credit for the period |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net actuarial gain (loss) for the period |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Amortization of actuarial loss and prior service cost included in net (loss) income |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Postretirement plans and workers' compensation obligations |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other comprehensive income from investment in subsidiaries |  |  |  |  |  |  |  |  |  | 7.2 | 21.8 | 150.2
Other comprehensive income (loss), net of income taxes |  |  |  |  |  |  |  |  |  | 7.2 | 21.8 | 150.2
Comprehensive loss |  |  |  |  |  |  |  |  |  | 181.7 | 925.0 | 224.9
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Comprehensive loss attributable to common stockholders |  |  |  |  |  |  |  |  |  | $ 181.7 | $ 925.0 | $ 224.9

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