STATEMENTS OF CONSOLIDATED SHAREHOLDERS' EQUITY - USD ($)	Total	Accounting Standards Update 2014-09 [Member]	Accounting Standards Update 2016-06	Accounting Standards Update 2016-13	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Accounting Standards Update 2014-09 [Member]	Retained Earnings [Member] Accounting Standards Update 2016-06	Retained Earnings [Member] Accounting Standards Update 2018-02	Retained Earnings [Member] Accounting Standards Update 2016-02 [Member]	Retained Earnings [Member] Accounting Standards Update 2016-13	AOCI Attributable to Parent [Member]	AOCI Attributable to Parent [Member] Accounting Standards Update 2018-02	AOCI Attributable to Parent [Member] Accounting Standards Update 2016-02 [Member]	Treasury Stock [Member]	Accounting Standards Update 2014-09 [Member] Retained Earnings [Member]
Common Stock, Shares, Issued					88,457,634
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,616,200,000					$ 602,900,000	$ 1,876,200,000						$ (113,000,000.0)			$ (754,300,000)
Stockholders' Equity Attributable to Parent													(113,000,000.0)
Other Comprehensive Income, Other, Net of Tax													(64,100,000)		$ (5,400,000)
Net Income	152,200,000						152,200,000
Other comprehensive income (loss)	(64,100,000)
Dividends	(55,400,000)					500,000	(55,900,000)
Payment, Tax Withholding, Share-based Payment Arrangement	(4,700,000)															(4,700,000)
Payments for Repurchase of Common Stock	117,200,000															117,200,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	33,900,000					33,900,000										22,700,000
Stock Issued During Period, Value, Stock Options Exercised	14,500,000					2,600,000										$ 11,900,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures						(7,700,000)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures																7,700,000
Stock Issued During Period, Value, Employee Stock Purchase Plan	8,400,000					5,200,000										$ 3,200,000
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted		(4.9)	—
Common Stock, Shares, Issued					88,457,634
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,573,300,000				$ 4,400,000	637,400,000	1,967,400,000						(182,500,000)			(853,400,000)
Stockholders' Equity Attributable to Parent	4.9							$ (4,900,000)	$ (5,600,000)	$ 5,400,000	$ 5,400,000		(182,500,000)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification										$ 5,400,000
Net Income	223,000,000.0						223,000,000.0
Other comprehensive income (loss)	2,300,000												2,300,000
Dividends	(58,000,000.0)					500,000	(58,500,000)
Payment, Tax Withholding, Share-based Payment Arrangement	(16,500,000)															(16,500,000)
Payments for Repurchase of Common Stock	54,100,000															54,100,000
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	37,800,000					37,800,000										26,700,000
Stock Issued During Period, Value, Stock Options Exercised	8,600,000					2,900,000										$ 5,700,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures						(17,100,000)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures																17,100,000
Stock Issued During Period, Value, Employee Stock Purchase Plan	9,400,000					5,500,000										$ 3,900,000
Cumulative Effect on Retained Earnings, Net of Tax	300,000
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted																	0.3
Common Stock, Shares, Issued					88,457,634
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,726,100,000				$ 4,400,000	667,000,000.0	2,132,200,000						(180,200,000)			(897,300,000)
Stockholders' Equity Attributable to Parent	1,726,100,000												(180,200,000)	$ 2,300,000
Net Income	248,500,000						248,500,000
Other comprehensive income (loss)	44,200,000
Dividends	(62,000,000.0)					600,000	(62,600,000)
Payment, Tax Withholding, Share-based Payment Arrangement	(9,500,000)															(9,500,000)
Payments for Repurchase of Common Stock	130,700,000															(130,700,000)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	44,500,000					44,500,000										25,400,000
Stock Issued During Period, Value, Stock Options Exercised	10,500,000					3,500,000										$ 7,000,000.0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures						(14,500,000)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures																14,500,000
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 10,300,000					6,500,000										$ 3,800,000
New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted				(2.2)
Common Stock, Shares, Issued	88,457,634				88,457,634
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,879,700,000				$ 4,400,000	$ 707,600,000	$ 2,315,900,000						(136,000,000.0)			$ (1,012,200,000)
Stockholders' Equity Attributable to Parent	$ 1,879.7											$ (2,200,000)	$ (136,000,000.0)	$ 44,200,000