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Share Repurchases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 14, 2015
Equity, Class of Treasury Stock [Line Items]
Payments for Repurchase of Common Stock	$ 0.0	$ 0.0	$ 75.0
2015 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 1,500.0
Stock Repurchased and Retired During Period, Shares	15,765,025
Payments for Repurchase of Common Stock	$ 650.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 850.0

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The cash outflow to reacquire common stock during the period.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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