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Shareholders Equity Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 9,722.2				$ 9,722.2		$ 8,088.8
Net income (loss)	407.3		$ (150.1)		219.3	$ (290.6)
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 88.0
Shares Issued Under Share Based Compensation Plans, Shares	2,600,000		3,400,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			$ (0.7)
Other Comprehensive Income (Loss), Net of Tax	$ 0.2		$ (8.5)		$ 1.7	$ (8.9)
Common Stock [Member]
Shares, Issued	205,800,000	115,200,000	115,200,000	111,800,000	205,800,000	115,200,000	115,200,000		111,800,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 82.5	$ 46.2	$ 46.2	$ 44.8	$ 82.5	$ 46.2	$ 46.2		$ 44.8
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 35.2
Shares Issued Under Share Based Compensation Plans, Shares	1,100,000		1,400,000
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 8,608.4	$ 7,230.2	$ 7,209.5	$ 7,202.4	8,608.4	7,209.5	7,225.0		7,195.0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 1,365.5
Shares Issued Under Share Based Compensation Plans, Shares	(1,100,000)	(100,000)	(400,000)	(100,000)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 13.8	$ 5.3	$ 7.5	$ 7.5
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,084.8	679.3	1,232.0	1,387.4	1,084.8	1,232.0	874.2		1,532.7
Net income (loss)	405.5	(190.4)	(151.0)	(140.1)
Dividends, Common Stock, Cash		(4.5)	(4.4)	(4.4)
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				(0.8)
AOCI Attributable to Parent [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	19.9	19.7	20.5	29.0	19.9	20.5	18.2		28.6
Other Comprehensive Income (Loss), Net of Tax	0.2	1.5	(8.5)	(0.4)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption								$ 0.8
Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(75.0)	$ (74.9)	$ (72.0)	$ (70.0)	(75.0)	(72.0)	(72.2)		(69.0)
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 2.1
Shares Issued Under Share Based Compensation Plans, Shares	(800,000)	100,000	(1,400,000)	100,000
Stock Repurchased During Period, Value	$ (1.4)	$ (2.8)	$ (0.6)	$ (1.1)
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1.6	(0.2)	(2.3)	(2.5)	$ 1.6	$ (2.3)	$ (2.6)		$ (2.1)
Net income (loss)	$ 1.8	$ 2.4	$ 0.9	$ (0.4)

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