Income Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jul. 01, 2011	Jul. 02, 2010	Jul. 01, 2011	Jul. 02, 2010
Basic Income per Share:
Net income	$ 52.1	$ 34.6	$ 96.4	$ 40.5
Weighted-average common shares outstanding	34.8	33.9	34.7	34.1
Basic	$ 1.50	$ 1.02	$ 2.78	$ 1.19
Diluted Income (Loss) per Share:
Net income	$ 52.1	$ 34.6	$ 96.4	$ 40.5
Weighted-average common shares outstanding	34.8	33.9	34.7	34.1
Effect of dilutive securities:
Stock options and units	0.4	0.5	0.5	0.5
Diluted weighted-average common shares outstanding	36.3	35.4	36.2	35.6
Net income per diluted share	$ 1.43	$ 0.98	$ 2.66	$ 1.14
Convertible Notes Due 2013 [Member]
Effect of dilutive securities:
Convertible Notes due	0.6		0.6
Convertible Notes Due 2033 [Member]
Effect of dilutive securities:
Convertible Notes due	0.5	1.0	0.4	1.0

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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