Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares available for issuance under the 2011 Plan (in shares)	3,005,139
Stock options, granted (in shares)	450,681
Stock options, weighted average exercise price (in dollars per share)	$ 59.25
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)	$ 11.42
Assumptions used in Black-Scholes model
Risk-free interest rate (in hundredths)	0.89%
Expected life (in years)	6 years
Stock volatility (in hundredths)	22.50%
Dividend yield (in hundredths)	1.30%
Granted, PVS awards (in shares)	86,840
Grant date fair value, PVS awards (in dollars per share)	$ 59.25
Number of shares of common stock per PVS award (in shares)	1
Performance period for the annual growth rate of revenue and return on invested capital targets to be achieved	3 years
PVS payout, Minimum (in hundredths)	0.00%
PVS payout, Maximum (in hundredths)	200.00%
Stock-based compensation expense	$ 5.4	$ 3.2