Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-Based Compensation [Abstract]
Shares available for issuance under the 2011 Plan (in shares)	3,995,034			3,995,034
Stock options, granted (in shares)		545,085
Stock options, weighted average exercise price (in dollars per share)		$ 42.44
Stock options, vesting period (in years)		4 years
Stock options, expiration period (in years)		10 years
Stock options, weighted average grant date fair value (in dollars per share)		$ 7.93
Assumptions used in Black-Scholes model
Risk-free interest rate (in hundredths)		0.92%
Expected life (in years)		6 years
Stock volatility (in hundredths)		23.30%
Dividend yield (in hundredths)		1.70%
Number of shares of common stock per PVS award (in shares)		1
PVS payout, Minimum (in hundredths)		0.00%
PVS payout, Maximum (in hundredths)		200.00%
Granted, PVS awards (in shares)		101,857
Grant date fair value, PVS awards (in dollars per share)		$ 42.44
Stock-based compensation expense	$ 4.3		$ 3.2	$ 7.5	$ 6.5
Stock Option Expense In Restructuring And Other			$ 2.1		$ 2.1