Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) segment $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | segment	2
Depreciation and amortization	$ 24.9	$ 25.0
Net income (loss)	$ 24.6	$ 43.4
Net income (loss) (in dollars per shares) | $ / shares	$ 0.37	$ 0.64
Adjustment to retained earnings as a result of adoption of new accounting guidance	$ 683.3		$ 676.7
Adjustment to other liabilities as a result of adoption of new accounting guidance	(264.5)		(319.8)
Adjustment to deferred income taxes as a result of adoption of new accounting guidance	$ (525.6)		$ (529.4)