Condensed Consolidated Statements of Shareholders' Equity (unaudited) Statement - USD ($) $ in Millions	Total	Noncontrolling Interest [Member]	Treasury Stock [Member]	Common Stock [Member]	Parent [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,365.6	$ 7.4	$ (796.8)	$ 4.4	$ 1,358.2	$ 1,676.2	$ (110.0)	$ 584.4
Common Stock, Shares, Outstanding			22,643,840	65,813,794
Other Comprehensive Income (Loss), Net of Tax	10.3						10.3
Net Income	88.3				88.3
Net Income (Loss) Attributable to Parent	88.3
Stock Issued During Period, Value, Employee Stock Purchase Plan	1.5		$ 0.6		1.5			0.9
Stock Issued During Period, Shares, Employee Stock Purchase Plans			(17,680)	17,680
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition								(3.9)
Stock Issued During Period, Value, Restricted Stock Award, Gross			$ 3.9
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			(110,867)	110,867
Stock Issued During Period, Value, Stock Options Exercised	8.1		$ 8.5		8.1			(0.4)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			(240,856)	240,856
Share-based Compensation on Equity-Classified Awards	6.1				6.1			6.1
Dividends	(11.9)				(11.9)	(12.0)		(0.1)
Shares Paid for Tax Withholding for Share Based Compensation			43,374	(43,374)
Payments Related to Tax Withholding for Share-based Compensation	(3.5)				3.5
Other Comprehensive Income (Loss), Tax							2.3
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | VIE Activity [Member]	(0.4)	(0.4)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,464.1	$ 7.0	$ (787.3)	$ 4.4	1,457.1	1,752.5	(99.7)	587.2
Common Stock, Shares, Outstanding			22,317,811	66,139,823
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,616.2		$ (754.3)	$ 4.4		1,876.2	(113.0)	602.9
Common Stock, Shares, Outstanding	67,256,112		21,201,522	67,256,112
Cumulative Effect on Retained Earnings, Tax | Accounting Standards Update 2014-09 [Member]	$ 4.8
Cumulative Effect on Retained Earnings, Tax | Accounting Standards Update 2016-16 [Member]	0.2
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(5.4)					5.4	(5.4)
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2014-09 [Member]	(4.9)					(4.9)
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-16 [Member]	(5.6)
Other Comprehensive Income (Loss), Net of Tax	(16.9)						(16.9)
Net Income	42.2
Net Income (Loss) Attributable to Parent	42.2
Stock Issued During Period, Value, Employee Stock Purchase Plan	1.9		$ 0.8					1.1
Stock Issued During Period, Shares, Employee Stock Purchase Plans			(21,445)	21,445
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition								(4.0)
Stock Issued During Period, Value, Restricted Stock Award, Gross			$ 4.0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			(112,464)	112,464
Stock Issued During Period, Value, Stock Options Exercised	4.6		$ 3.6					1.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			(97,575)	97,575
Share-based Compensation on Equity-Classified Awards	5.8							5.8
Dividends	(13.3)					(13.4)		(0.1)
Shares Paid for Tax Withholding for Share Based Compensation			37,445	(37,445)
Payments Related to Tax Withholding for Share-based Compensation	$ (3.5)
Treasury Stock, Shares, Acquired	800,000		792,264	(792,264)
Payments for Repurchase of Common Stock	$ (75.0)				$ (75.0)
Other Comprehensive Income (Loss), Tax							(0.1)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,551.5		$ (824.4)	$ 4.4		$ 1,899.9	$ (135.3)	$ 606.9
Common Stock, Shares, Outstanding	66,657,887.000000		21,799,747	66,657,887