Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

No definition available.

Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vested and exercisable, number of shares	1,408,612
Unrecognized compensation cost	$ 1.9
Options, vested and exercisable, intrinsic value	22.5
Options, exercised, intrinsic value	0.8	$ 0.3
Cash received from options exercised	1.9	0.1
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued liabilities for awards	$ 2.3		$ 1.9
Award weighted average fair value (in usd per share)	$ 16.55		$ 13.45
Outstanding Intrinsic value	$ 2.1
Exercisable Intrinsic value	$ 2.1
Awards outstanding (in shares)	137,304		143,603
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, vested, fair value	$ 2.5	$ 1.3
Awards outstanding (in shares)	1,428,912		1,558,441
Unrecognized compensation cost, period for recognition	2 years 3 months 5 days
RSUs - subject to service conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	1,229,948
RSUs - subject to service and market conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	198,964
Performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, vested, fair value	$ 2.3
Awards outstanding (in shares)	1,869,025		1,987,060
Unrecognized compensation cost, amount not deemed probable	$ 21.2
PRSUs - subject to service, market and performance conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	1,632,869
PRSUs - subject to service and performance conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	236,156
Restricted Stock Units and Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 20.9
Cash-settled performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	71.6
Accrued liabilities for awards	$ 4.8
Award weighted average fair value (in usd per share)	$ 30.70
Awards outstanding (in shares)	2,486,912		0
Unrecognized compensation cost, period for recognition	3 years 9 months
Annual vesting percentage	25.00%
Vesting period	4 years