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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows of Registrant (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:                      
Net income (loss) $ 24.0 $ 39.8 $ (51.4) $ 260.8 $ 36.2 $ (93.0) $ 15.9 $ 7.0 $ 273.2 $ (33.9) $ (512.4)
Adjustments to reconcile net (loss) income to operating cash flows from continuing operations:                      
Depreciation of properties and amortization of intangibles                 132.2 120.4 107.4
Stock-based compensation                 52.9 70.8 66.0
Amortization of debt issuance costs                 15.5 18.3 17.2
Amortization of debt discount                 1.8 2.8 4.8
Write-off of discounts and debt issuance costs on retired debt                 2.5 5.8 12.8
Dividends from subsidiaries                 12.2 12.2 12.2
Gain On Contingent Purchase Price Adjustment                     (8.5)
Changes in operating assets and liabilities:                      
Net change in cash due to continuing operating activities                 840.1 913.3 289.8
Cash flows from investing activities:                      
Proceeds from investments sold, matured or repaid                   35.1 70.8
Capital expenditures                 (77.8) (61.0) (56.6)
Net change in cash due to continuing investing activities                 (1,602.4) (891.4) (2,141.3)
Cash flows from financing activities:                      
Payments of Debt Issuance Costs                 (7.0) (9.3) (44.8)
Common stock repurchased                     (22.2)
Share based award tax withholding payments                 (40.8) (28.7) (21.0)
Other financing activities, net                 6.5 3.0 9.4
Net change in cash due to continuing financing activities                 583.0 148.7 1,730.8
Cash and Cash Equivalents, Period Increase (Decrease)                 (195.1) (178.0) (30.4)
Cash and cash equivalents at beginning of period       465.2       643.2 465.2 643.2 673.6
Cash and cash equivalents at end of period 270.1       465.2       270.1 465.2 643.2
Parent Company [Member]                      
Cash flows from operating activities:                      
Net income (loss)                 106.0 (198.8) (556.8)
Adjustments to reconcile net (loss) income to operating cash flows from continuing operations:                      
Equity in net income of subsidiaries                 497.8 (214.8) (357.2)
Depreciation of properties and amortization of intangibles                 0.3 0.3 0.5
Stock-based compensation                 5.2 13.7 25.0
Amortization of debt issuance costs                 6.1 2.7 4.4
Amortization of debt discount                 1.0 3.3 1.8
Dividends from subsidiaries                 118.9 63.5 65.7
Deferred income taxes                 (205.9) 205.8 0.0
Gain On Contingent Purchase Price Adjustment                 0.0 0.0 (8.5)
Changes in operating assets and liabilities:                      
Accounts payable and accrued and other current liabilities                 (10.6) (3.6) 29.0
Net change in cash due to continuing operating activities                 (65.0) (109.9) (81.7)
Cash flows from investing activities:                      
Capital contributions to consolidated subsidiaries                 (3.1) (2.9) (406.4)
Capital expenditures                 0.0 (0.1) (1.2)
Net change in cash due to continuing investing activities                 (3.1) (3.0) (407.6)
Cash flows from financing activities:                      
Proceeds from senior secured notes                 0.0 0.0 409.6
Payments of Debt Issuance Costs                 0.0 0.0 (6.8)
Common stock repurchased                 0.0 0.0 (22.1)
Share based award tax withholding payments                 (16.4) (17.8) (18.3)
Other financing activities, net                 6.5 4.4 4.1
Net change in cash due to continuing financing activities                 (9.9) (13.4) 366.5
Cash and Cash Equivalents, Period Increase (Decrease)                 (78.0) (126.3) (122.8)
Cash and cash equivalents at beginning of period       $ 170.9       $ 297.2 170.9 297.2 420.0
Cash and cash equivalents at end of period $ 92.9       $ 170.9       $ 92.9 $ 170.9 $ 297.2