Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2014			$ 1,012.3
Net Income	$ 57.6	$ (40.0)	112.7	$ (4.8)
Other Comprehensive Income, Net of Tax	31.1	$ 2.4	14.7	$ 6.5
Dividends declared			(32.9)
Repurchase of Common Stock			(8.0)
Compensation Expense Under Share-Based Plans			11.5
Issuance of Common Stock in payout of RSUs, Net of Stock Withheld for Taxes			(21.1)
Balance at June 30, 2015	$ 1,089.2		$ 1,089.2