Share-Based Payments (Options and Stock Appreciation Rights Outstanding) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available For Grant, Beginning Balance	291,000
Shares Available For Grant, Exercised	0
Shares Available For Grant, Forfeited	0
Shares Available For Grant, Expired	0
Shares Available For Grant, Granted	0
Shares Available For Grant, Ending Balance	291,000
Shares/Awards
Balance at January 1, 2015	29,768
Exercised	0
Forfeited	0
Expired	0
Granted	0
Balance at March 31, 2015	29,768
Weighted-Average Exercise Price (usd per share)
Balance at January 1, 2015	$ 242.48
Exercised	$ 0.00
Forfeited	$ 0.00
Expired	$ 0.00
Granted	$ 0.00
Balance at March 31, 2015	$ 242.48
Compensation cost, liability balance	$ 8.4	$ 7.1
Cash received from exercise of options	0.3	0.4
Total fair value of shares vested	0	0
Stock Appreciation Rights [Member]
Shares/Awards
Balance at January 1, 2015	92,186
Exercised	(775)
Forfeited	0
Granted	0
Balance at March 31, 2015	91,411
Weighted-Average Exercise Price (usd per share)
Balance at January 1, 2015	$ 157.71
Exercised	$ 116.95
Forfeited	$ 0.00
Granted	$ 0.00
Balance at March 31, 2015	$ 158.05
Total intrinsic value of options exercised	0.1	0.5
Total share-based liabilities paid	$ 0.1	$ 0.5