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Share-based Payments, Stock Options (Details 2) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit for tax deductions from options during the fiscal year	$ 2,300,000	$ 14,000,000	$ 3,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Proceeds from Stock Options Exercised	$ 0		$ 3,800,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of years the employee stock options vest in equal annual installments	3 years
Assumptions used to calculate the fair value of stock options in each period are noted in the following table. A summary of the assumptions used to estimate the fair value of stock option awards is as follows:
Expected volatility (percent)		35.35%	42.54%
Expected dividend yield (percent)		1.97%	3.86%
Expected term (in years)		7 years	7 years
Risk-free interest rate (percent)		2.34%	1.65%
Shares (in millions)
Number of option shares outstanding at beginning of period (in shares)	2.6
Granted (in shares)	0.0
Exercised (in shares)	(0.2)
Number of option shares outstanding at end of period (in shares)	2.4	2.6
Number of shares issuable under options exercisable at end of period (in shares)	2.0
Weighted Average Exercise Price
Weighted average exercise price- options outstanding at beginning of period (in usd per share)	$ 49.20
Granted (in usd per share)	0.00
Exercised (in usd per share)	91.88
Weighted Average Exercise Price- options outstanding at end of period (in usd per share)	45.50	$ 49.20
Weighted Average Exercise Price- options exercisable at end of period (in usd per share)	$ 48.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term (Years) - options outstanding at end of fiscal year	4 years
Weighted Average Remaining Contractual Term (Years) - options exercisable as of the end of the fiscal year	3 years 5 months
Aggregate Intrinsic Value - options outstanding at end of fiscal year	$ 0
Aggregate Intrinsic Value - options exercisable as of the end of the fiscal year	0
The weighted-average grant date fair value of options granted during the fiscal year (in usd per share)		$ 9.91	$ 8.37
The total intrinsic value of options exercised during the fiscal year	0
Proceeds from Stock Options Exercised	$ 0

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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