Share-Based Payments (Options and Stock Appreciation Rights Outstanding) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available For Grant, Beginning Balance (in shares)	291,000
Shares Available For Grant, Exercised (in shares)	0
Shares Available For Grant, Forfeited (in shares)	0
Shares Available For Grant, Expired (in shares)	0
Shares Available For Grant, Granted (in shares)	0
Shares Available For Grant, Ending Balance (in shares)	291,000
Shares/Awards
Opening Balance (in shares)	27,768
Expired (in shares)	0
Exercised (in shares)	0
Forfeited (in shares)	0
Granted (in shares)	0
Ending Balance (in shares)	27,768
Weighted-Average Exercise Price (usd per share)
Opening Balance (in usd per share)	$ 243.26
Expired (in usd per share)	0.00
Exercised (in usd per share)	0.00
Forfeited (in usd per share)	0.00
Granted (in usd per share)	0.00
Ending Balance (in usd per share)	$ 243.26
Liability Awards
Compensation cost, liability balance	$ 6.2	$ 8.4
Cash received from exercise of options	0.6	0.3
Total fair value of shares vested	$ 0.0	$ 0.0
Stock Appreciation Rights [Member]
Liability Awards
Granted (in shares)	14,643
Exercised (in shares)	275
Forfeited (in shares)	0
Closing balance (in shares)	100,629.000	86,261
Total intrinsic value of options exercised	$ 0.1	$ 0.1
Total share-based liabilities paid	$ 0.0	$ 0.1
Restricted Stock Units (RSUs) [Member]
Liability Awards
Granted (in shares)	3,661
Exercised (in shares)	0
Forfeited (in shares)	0
Closing balance (in shares)	3,661.000	0
Performance Shares [Member]
Liability Awards
Granted (in shares)	5,727
Exercised (in shares)	0
Forfeited (in shares)	0
Closing balance (in shares)	5,727	0