Employee Benefit Plans (Details) - USD ($)		3 Months Ended	6 Months Ended
	Apr. 01, 2016	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	May 19, 2015
Share-Based Compensation Plans
Common stock, shares, issued		382,800,000	382,800,000	384,000,000
Outstanding stock options, restricted stock units, and restricted stock awards from awards assumed (in shares)		1,200,000	1,200,000
Number of Shares
Balance at beginning of period (in shares)			3,600,000
Exercised (in shares)			(400,000)
Expired (in shares)			(200,000)
Balance at end of period (in shares)		3,000,000	3,000,000
Weighted Average Exercise Price per Share
Balance at beginning of period (in dollars per share)			$ 27.52
Exercised (in dollars per share)			14.10
Expired (in dollars per share)			33.80
Balance at end of period (in dollars per share)		$ 28.98	$ 28.98
Weighted average remaining contractual term at end of period			1 year 9 months 18 days
Aggregate intrinsic value at end of period		$ 7,300,000	$ 7,300,000
Vested or expected-to-vest options at end of period (in shares)		3,000,000	3,000,000
Vested or expected-to-vest options, weighted average exercise price at end of period (in dollars per share)		$ 28.99	$ 28.99
Vested and expected-to-vest options, weighted average remaining contractual term at end of period			1 year 9 months 18 days
Vested or expected-to-vest options, aggregate intrinsic value at end of period		$ 7,200,000	$ 7,200,000
Exercisable options at end of period (in shares)		3,000,000	3,000,000
Exercisable options, weighted average exercise price at end of period (in dollars per share)		$ 29.37	$ 29.37
Exercisable options, weighted average remaining contractual term at end of period			1 year 8 months 12 days
Exercisable options, aggregate intrinsic value at end of period		$ 6,400,000	$ 6,400,000
Share price (in dollars per share)		$ 22.49	$ 22.49
Pre-tax intrinsic value of options exercised		$ 400,000	$ 4,300,000
Market-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
Restricted Stock Units (RSUs) and Performance Shares [Member] | BTI Systems, Inc [Member]
Share-Based Compensation Plans
Assumed (in shares)	400,000
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
Equity incentive plan 2015 [Member]
Share-Based Compensation Plans
Number of shares in authorized					38,000,000
Number of shares available for future issuance		22,900,000	22,900,000
Equity Incentive Plan 2015, 2006, and 1996 [Member]
Share-Based Compensation Plans
Maximum additional shares expire unexercised, under 1996 and 2000 plan					29,000,000
Equity Incentive Plan 2015 and 2006 [Member]
Share-Based Compensation Plans
Number of shares outstanding		20,400,000	20,400,000
Equity Incentive Plan 1996 [Member]
Share-Based Compensation Plans
Number of shares outstanding		0	0
Equity Incentive Plan 1996 and 2006 [Member]
Share-Based Compensation Plans
Number of shares available for future issuance		0	0
Employee stock purchase plan 2008 [Member]
Share-Based Compensation Plans
Number of shares available for future issuance		6,300,000	6,300,000
Common stock, capital shares reserved for future issuance		26,000,000	26,000,000
Share-based compensation arrangement by share-based payment award, discount from market price			15.00%
Periodic payroll deduction - percentage of base salary		10.00%	10.00%
Maximum purchase of common stock, shares			6,000
Share-based compensation arrangement by share-based payment award, offering period			12 months
Maximum purchase of common stock, value			$ 25,000
Share-based compensation arrangement by share-based payment award, expiration period			1 year
Common stock, shares, issued		19,700,000	19,700,000
Employee Stock Purchase Plan 2008 Additional Authorization [Member]
Share-Based Compensation Plans
Common stock, capital shares reserved for future issuance		7,000,000	7,000,000