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Stockholders' Equity Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Schedule of Capitalization, Equity [Line Items]
Retained earnings	$ 478.5		$ 486.9
Noncontrolling interest			0us-gaap_MinorityInterest
Net Income (Loss) Attributable to Noncontrolling Interest, Other	0	3.9
Authorized capitalization of common stock (in shares)	300,000,000us-gaap_CommonStockSharesAuthorized		300,000,000us-gaap_CommonStockSharesAuthorized
Par value of common stock (in dollars per share)	$ 0.01
Authorized capitalization of preferred stock (in shares)	3,500,000us-gaap_PreferredStockSharesAuthorized
Par value of preferred stock per share (in dollars per share)	$ 0.01
Number of shares authorized to be repurchased (in shares)	10,000,000
Aggregate number of shares repurchased (in shares)	7,600,000us-gaap_TreasuryStockSharesAcquired
Aggregate cost of shares repurchased	49.8
Retained Earnings
Schedule of Capitalization, Equity [Line Items]
Retained earnings	478.5	344.4	486.9	353.2
Net Income (Loss) Attributable to Parent	(8.4)	(8.8)
Noncontrolling Interest, Decrease from Deconsolidation		0
Noncontrolling Interest
Schedule of Capitalization, Equity [Line Items]
Noncontrolling interest	0	0	0	6.8
Net Income (Loss) Attributable to Noncontrolling Interest, Other	0	3.9
Noncontrolling Interest, Decrease from Deconsolidation		$ (10.7)