Intangible Assets and Goodwill - Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 139.7		$ 140.5
Accumulated amortization	(85.5)		(82.6)
Intangible assets, net	54.2us-gaap_FiniteLivedIntangibleAssetsNet		57.9us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense	3.3us-gaap_AmortizationOfIntangibleAssets	3.2us-gaap_AmortizationOfIntangibleAssets
Intangible Assets, Amortization Expense, Remainder of 2015	8.8
Intangible Assets, Amortization Expense, 2016	9.9
Intangible Assets, Amortization Expense, 2017	8.7
Intangible Assets, Amortization Expense, 2018	6.6
Intangible Assets, Amortization Expense, 2019	6.2
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	34.1		34.2
Accumulated amortization	(15.1)		(14.0)
Intangible assets, net	19.0		20.2
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	60.1		60.1
Accumulated amortization	(56.0)		(55.3)
Intangible assets, net	4.1		4.8
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	19.6		20.0
Accumulated amortization	(4.1)		(3.7)
Intangible assets, net	15.5		16.3
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	25.9		26.2
Accumulated amortization	(10.3)		(9.6)
Intangible assets, net	15.6		16.6
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 12.1

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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