Goodwill and Intangible Assets - Components of Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in Years)	14 years 2 months 8 days	15 years 4 months 10 days
Gross Carrying Amount	$ 333.5	$ 328.0
Accumulated Amortization	40.0	17.4
Intangible asset amortization expense	22.6us-gaap_AmortizationOfIntangibleAssets	6.4us-gaap_AmortizationOfIntangibleAssets	3.1us-gaap_AmortizationOfIntangibleAssets
Estimated Future Intangible Amortization Expense
2015	22.6
2016	22.5
2017	22.4
2018	22.2
2019	21.3
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in Years)	14 years 3 months	15 years 4 months 28 days
Gross Carrying Amount	311.5	306.4
Accumulated Amortization	36.9	16.5
Trademarks and Trade Names
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in Years)	13 years 4 months 28 days	14 years 8 months 16 days
Gross Carrying Amount	21.8	21.4
Accumulated Amortization	3.0	0.8
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in Years)	2 years 2 months 12 days	3 years
Gross Carrying Amount	0.2	0.2
Accumulated Amortization	$ 0.1	$ 0.1

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next 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