Stock-Based Compensation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2010

Jun. 30, 2011

Jun. 30, 2010

Share-based compensation arrangement

In determining the fair value of stock options granted during the six months ended June 30, 2011, the Company utilized its historical experience to estimate the expected life of the options and volatility.

Pre-tax stock-based compensation

$ 8.6

$ 8.3

$ 16.8

$ 18.8

Restricted Stock Units (RSU) [Member]

Performance-based stock units awarded

0.5

Vesting period, years

three

Percentage of units that are earned, minimum

0.00%

Percentage of units that are earned, maximum

200.00%

Performance-based stock, outstanding

2.3

2.3

Shares entitled to recipients

1.4

Percentage of units granted assumed

100.00%