Fair Value - Nonrecurring Fair Value Measures (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Nonrecurring Fair Value Measures [Abstract]
Equity Method Investment, Ownership Percentage	8.00%
Equity Method Investment, Carrying Amount	$ 126.0	$ 121.1
Goodwill, Carrying Amount	131.0	2.9
Intangible Assets, Carrying Amount	$ 81.9	1.9
Nonrecurring Fair Value Measurements [Member]
Nonrecurring Fair Value Measures [Abstract]
Equity Method Investment, Ownership Percentage	8.00%
Equity Method Investment, Carrying Amount	$ 126.0	121.1
Equity Method Investment, Impairment	0.0	0.0
Goodwill, Carrying Amount	131.0	2.9
Goodwill, Impairment	0.0
Intangible Assets, Carrying Amount	81.9	1.9
Intangible Assets, Impairment	0.0
Property, Plant and Equipment, Impairment	$ 0.0	$ 0.0

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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