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Identifiable Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Indefinite-lived intangible assets: |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) |  | $ 780.6 | $ 780.6 | $ 778.2 |
Accumulated amortization: |  |  |  |  |
Accumulated amortization |  | (261.3) | (261.3) | (233.0) |
Net book value |  | 533.6 | 533.6 | 553.1 |
Goodwill |  | 5.4 | 5.4 | 0 |
Total intangible assets net book value |  | 533.6 | 533.6 | 553.1 |
Amortization |  |  | 29.4 | 31.8 | 30.9
Business Combination-Related Identifiable Intangible [Member] |  |  |  |  |
Accumulated amortization: |  |  |  |  |
Net book value |  | 519.3 | 519.3 | 545.2 |
Remaining weighted-average amortization period for the finite-lived intangible assets |  |  | 9 years 1 month 7 days |  |
Amortization |  |  | 28.3 | 29.5 | 29.4
Future Amortization Expense, 2014 |  | 27.7 | 27.7 |  |
Future Amortization Expense, 2015 |  | 22.2 | 22.2 |  |
Future Amortization Expense, 2016 |  | 22.2 | 22.2 |  |
Future Amortization Expense, 2017 |  | 22.4 | 22.4 |  |
Future Amortization Expense, 2018 |  | 22.3 | 22.3 |  |
Trademarks and Trade Names [Member] |  |  |  |  |
Indefinite-lived intangible assets: |  |  |  |  |
Trade names and trademarks |  | 300.0 | 300.0 | 300.0 |
Software and Software Development Costs [Member] |  |  |  |  |
Capitalized external-use software: |  |  |  |  |
Software cost |  | 14.3 | 14.3 | 12.2 |
Software accumulated amortization |  | (5.4) | (5.4) | (4.3) |
Software net book value |  | 8.9 | 8.9 | 7.9 |
Accumulated amortization: |  |  |  |  |
Remaining weighted-average amortization period for the finite-lived intangible assets | 3 years | 6 years |  |  |
Capitalized software, weighted average remaining useful life |  |  | 4 years 10 months |  |
Amortization |  |  | 1.1 | 2.3 | 1.5
Future Amortization Expense, 2014 |  | 1.5 | 1.5 |  |
Future Amortization Expense, 2015 |  | 1.8 | 1.8 |  |
Future Amortization Expense, 2016 |  | 1.8 | 1.8 |  |
Future Amortization Expense, 2017 |  | 1.5 | 1.5 |  |
Future Amortization Expense, 2018 |  | 1.2 | 1.2 |  |
Technology-Based Intangible Assets [Member] |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Technology intangible assets |  | 80.4 | 80.4 | 80.1 |
Accumulated amortization: |  |  |  |  |
Accumulated amortization |  | (68.1) | (68.1) | (61.5) |
Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |  |
Customer relationships and other |  | 400.2 | 400.2 | 398.1 |
Accumulated amortization: |  |  |  |  |
Accumulated amortization |  | $ (193.2) | $ (193.2) | $ (171.5) |

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