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Share-based Peyments, PSU's (Details 4) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Shares (in millions)
Share-based compensation arrangement, common stock issuance, percentage above target	150.00%
Weighted Average Grant Date Fair Value
Share-based compensation expense, net of forfeitures, in the fiscal year	$ 27.5	$ 28.0	$ 30.5
The tax benefit related to share-based compensation expense in the fiscal year	5.8	9.7	10.7
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized	$ 16.8
The average weighted-average period the unrecognized compensation cost will be recognized (years)	1 year
The total fair value of options vested during the fiscal year		4.2	4.5
Proceeds from Stock Options Exercised	$ 0.0		3.8
Tax benefit for tax deductions from options during the fiscal year	$ 2.3	$ 14.0	$ 3.3
TSR Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trading days to calculate weighted average stock price	30 days
Minimum retirement age for performance units to vest	60 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Expected volatility (percent)	34.30%	34.26%	35.67%
Expected dividend yield (percent)	0.37%	1.97%	3.86%
Expected term (in years)	3 years	3 years	3 years
Risk-free interest rate (percent)	2.42%	1.60%	0.99%
Shares (in millions)
Granted (in shares)	401,098
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value Per Share, Granted (in usd per share)	$ 28.09
Performance Units Cash Settled [Member]
Shares (in millions)
Granted (in shares)		329,599
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value Per Share, Granted (in usd per share)		$ 28.49
Performance Units
Shares (in millions)
Number of stock units outstanding at beginning of period (shares)	1,100,000
Granted (in shares)	400,000
Issued and canceled (shares)	(200,000)
Number of stock units outstanding at end of period (shares)	1,300,000	1,100,000
Weighted Average Grant Date Fair Value
Weighted-average grant date fair value per share - stock unit awards outstanding, beginning of period (in usd per share)	$ 33.26
Weighted Average Grant Date Fair Value Per Share, Granted (in usd per share)	28.09
Issued and canceled (in usd per share)	43.79
Weighted-average grant date fair value per share - stock unit awards outstanding, end of period (in usd per share)	$ 33.26	$ 33.26
Cost Reduction Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cost Saving Goal				$ 228.0
Shares (in millions)
Granted (in shares)				627,054
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value Per Share, Granted (in usd per share)				$ 49.17
Common Stock
Shares (in millions)
Granted (in shares)	934,346
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value Per Share, Granted (in usd per share)	$ 31.42

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