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Supplemental Financial Statement Information - Other Non-operating Income (Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Nonoperating Income (Expense) [Abstract]
Rent and royalty income	$ 4.0ati_RentRoyaltyandOtherIncome	$ 0.9ati_RentRoyaltyandOtherIncome	$ 0.7ati_RentRoyaltyandOtherIncome
Net gains (losses) on property and investments	0.1us-gaap_GainLossOnDispositionOfAssets1	0.7us-gaap_GainLossOnDispositionOfAssets1	(0.7)us-gaap_GainLossOnDispositionOfAssets1
Other	0ati_OtherOtherNonoperatingIncomeExpense	0.1ati_OtherOtherNonoperatingIncomeExpense	0ati_OtherOtherNonoperatingIncomeExpense
Other income, net	$ 4.1us-gaap_OtherNonoperatingIncomeExpense	$ 1.7us-gaap_OtherNonoperatingIncomeExpense	$ 0us-gaap_OtherNonoperatingIncomeExpense

X

- Definition

Other Other Nonoperating Income (Expense)

+ References

No definition available.

+ Details

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- Definition

Rent, Royalty, and Other Income

+ References

No definition available.

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- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228

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- Definition

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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