Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares available for issuance under the 2011 Plan (in shares)	2,935,331		2,935,331
Stock options, granted (in shares)			461,174
Stock options, weighted average exercise price (in dollars per share)			$ 59.43
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)			$ 11.46
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)			88,476
Grant date fair value, PVS awards (in dollars per share)			$ 59.42
Number of shares of common stock per PVS award (in shares)	1		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%		0.00%
PVS payout, Maximum (in hundredths)	200.00%		200.00%
Stock-based compensation expense	$ 5.0	$ 4.3	$ 10.4	$ 7.5