Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares available for issuance under the 2011 Plan (in shares)	4,134,749		4,134,749
Stock options, granted (in shares)			612,621
Stock options, weighted average exercise price (in dollars per share)			$ 47.21
Stock options, weighted average grant date fair value (in dollars per share)			$ 10.34
Assumptions used in Black-Scholes model
Risk-free interest rate (in hundredths)			1.58%
Expected life (in years)			6 years
Stock volatility (in hundredths)			22.00%
Dividend yield (in hundredths)			0.80%
Granted, PVS awards (in shares)			133,823
Grant date fair value, PVS awards (in dollars per share)			$ 47.21
Number of shares of common stock per PVS award (in shares)	1		1
Performance period			3 years
PVS payout, Minimum (in hundredths)	0.00%		0.00%
PVS payout, Maximum (in hundredths)	200.00%		200.00%
Stock-based compensation expense	$ 3.6	$ 5.2	$ 12.5	$ 15.6