Share-Based Compensation (Expense Related to Non-vested Stock Awards) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Total pre-tax share-based compensation expense	$ 12.9		$ 12.5		$ 11.7
Excess tax benefit on share-based compensation	(0.7)	[1]	(0.6)	[1]	1.0	[1]
Non-Qualified Stock Option Expense [Member]
Total pre-tax share-based compensation expense	5.5		4.9		4.8
Non-Vested Stock Awards Expense [Member]
Total pre-tax share-based compensation expense	0.2		1.7		2.8
Stock Unit Awards [Member]
Total pre-tax share-based compensation expense	5.2		4.5		3.1
Performance-Based Non-Vested Stock Awards Expense [Member]
Total pre-tax share-based compensation expense	$ 2.0		$ 1.4		$ 1.0

[1] Cash inflows (outflows) recognized as financing and operating activities in the Company’s consolidated statement of cash flows