Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-based compensation
Pre-tax compensation expense related to discontinued operations	$ 0.9	$ 1.6	$ 3.4
Stock-based compensation expense
Pre-tax compensation expense	17.0	18.5	15.7
The amount of financing cash flows of excess income tax benefits related to share-based compensation expense	5.3	11.7	3.2
2008 Executive Incentive Program
Stock-based compensation
Shares available for grant under the plan	3,094,447
Stock options
Stock-based compensation
Portion of stock options vesting on the first anniversary	0.3333
Portion of stock options vesting on the second anniversary	0.3333
Portion of stock options vesting on the third anniversary	0.3333
Maximum term life	10 years
Stock-based compensation expense
Pre-tax compensation expense	4.9	7.5	6.6
After-tax compensation expense	3.0	4.7	4.1
Impact on diluted EPS (in dollars per share)	$ 0.05	$ 0.07	$ 0.07
Unrecognized compensation cost related to stock options	3.2
Weighted average period of recognition of unrecognized compensation cost related to stock options	1 year 9 months
Weighted-average assumptions used to estimate grant date fair value of stock options
Expected dividend yield (as a percent)	1.20%	1.50%	1.70%
Expected life in years	5 years 8 months 16 days	5 years 9 months 11 days	5 years 9 months 4 days
Expected volatility (as a percent)	32.20%	36.00%	32.00%
Risk-free interest rate (as a percent)	1.00%	0.90%	2.20%
Weighted average fair value (in dollars per share)	$ 17.58	$ 14.57	$ 10.61
Stock options | 2005 Nonemployee Director Equity Plan
Stock-based compensation
Shares available for grant under the plan	267,210
Restricted and Performance Share Award | 2008 Executive Incentive Program
Stock-based compensation
Shares available for grant under the plan	693,705
Restricted shares
Stock-based compensation expense
Pre-tax compensation expense	4.6	5.0	5.2
Unrecognized compensation cost related to stock options	$ 2.9
Weighted average period of recognition of unrecognized compensation cost related to stock options	1 year 8 months 5 days
Restricted shares | 2005 Nonemployee Director Equity Plan
Stock-based compensation
Shares available for grant under the plan	37,210