CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Net unrealized gains (losses) related to cash flow hedges:
Unrealized holding gains (losses), tax expense (benefit)	$ 0.2	$ 0.2
Reclassification adjustment for (gains) losses included in net income, tax (expense) benefit	3.4	(2.6)
Net unrealized gains (losses) on marketable securities available for sale:
Unrealized holding gains (losses), tax expense (benefit)	0	0
Reclassification adjustment for (gains) losses included in net income, tax (expense) benefit	$ 0	$ 0

Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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- Definition

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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